4.7 Article

Potential improvement in performance and emissions of air-cooled rotary engine using novel enhanced cooling fins

Related references

Note: Only part of the references are listed.
Article Thermodynamics

Multi-objective optimization of a hydrogen-fueled Wankel rotary engine based on machine learning and genetic algorithm

Huaiyu Wang et al.

Summary: In this paper, the intake and exhaust phases and excess air ratios for Wankel rotary engines were optimized using machine learning and genetic algorithm. A prediction model for performance and emissions was built and combined with genetic algorithm for multi-objective optimization. The results showed that the timing of intake port full closing and exhaust port start opening had the most significant influence on performance and emissions. Compared with the original engine, the optimized engine achieved improvements in average effective pressure, fuel consumption, and nitrogen oxides emissions.

ENERGY (2023)

Article Energy & Fuels

Running battery electric vehicles with extended range: Coupling cost and energy analysis

Chen Yang

Summary: The widespread adoption of electric vehicles in the transportation sector has led to efforts to increase the energy density of battery packs, which impacts driving range and cost. Integrating advanced battery technologies throughout the production chain is crucial for optimizing performance. The development of emerging battery chemistries and novel module designs are key areas of focus for future advancements in electric vehicles.

APPLIED ENERGY (2022)

Article Energy & Fuels

Comparatively investigating the leading and trailing spark plug on the hydrogen rotary engine

Jinxin Yang et al.

Summary: This study experimentally investigated the effect of spark plug position on the combustion and emission characteristics of a hydrogen-fueled Wankel rotary engine, finding that the leading spark plug is more suitable. With the leading spark plug position, a wider ignition range, higher maximum torque, and lower nitric oxide emissions were achieved.
Article Energy & Fuels

Comparative analysis on combustion and emissions between CO2 and EGR dilution GDI engine at half-load, stoichiometric and lean-burn conditions

Changming Gong et al.

Summary: The study found that CO2 dilution had more advantages in a GDI engine compared to EGR dilution, but to achieve the same combustion, the dilution rate for CO2 dilution should be significantly increased compared to EGR dilution.
Article Energy & Fuels

Evaluation and analysis of injection strategy in a peripheral ported rotary engine fueled with natural gas/hydrogen blends under the action of apex seal leakage

Baowei Fan et al.

Summary: NHBF is considered a promising alternative fuel for rotary engines, and this study analyzed the influence of injection angle and timing on combustion performance. The study also considered the impact of apex seal leakage on flow field and combustion processes. Results showed that Case: 150 + 0 had the highest combustion speed in the cylinder, recommending its use for practical engineering applications to improve combustion performance in rotary engines fueled with NHBF.
Article Energy & Fuels

Investigation of Parameters Affecting Rotary Engine by Means of a One Zone Thermodynamic Model

Osman Akin Kutlar et al.

Summary: The study developed a thermodynamic calculation model for analyzing a 13B multi-side port rotary engine based on Mazda RX-8, validated with experimental data. Various parameters such as combustion chamber pressure, mass, engine torque, and intake port variations were investigated to examine the engine characteristics.

JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME (2022)

Article Energy & Fuels

Modeling and parametric study of the performance-emissions trade-off of a hydrogen Wankel rotary engine

Huaiyu Wang et al.

Summary: This study investigates the effects of intake port closing (IPC) timing and exhaust port opening (EPO) timing on the performance and emissions of a hydrogen Wankel rotary engine (WRE) using a one-dimensional model. The simulation results show that leakage and crevice reduce the indicated mean effective pressure, while crevice has a smaller impact on volumetric efficiency compared to leakage. Advancing the IPC increases in-cylinder mass and indicated mean effective pressure, but also leads to higher relative NOx emissions. In contrast, the effects of EPO timing on performance and emissions are reversed.
Article Chemistry, Physical

An experimental study on ignition timing of hydrogen Wankel rotary engine

Jinxin Yang et al.

Summary: This study investigated the effect of ignition timing on a hydrogen-fueled Wankel rotary engine under low speed, part load, and lean combustion conditions, highlighting the importance of selecting the appropriate ignition timing for engine performance.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2022)

Article Green & Sustainable Science & Technology

Simulation on the effect of compression ratios on the performance of a hydrogen fueled opposed rotary piston engine

Jianbing Gao et al.

Summary: Hydrogen internal combustion engines are gaining attention for their zero carbon dioxide emission and high thermal efficiency. This study investigated the combustion characteristics of a small-scale opposed rotary piston engine with different compression ratios using numerical simulation. The results showed that increasing the compression ratio improved the maximum in-cylinder pressure and indicated thermal efficiency, but also increased nitrogen oxide emissions.

RENEWABLE ENERGY (2022)

Article Meteorology & Atmospheric Sciences

Impacts of regional emission reduction and global climate change on air quality and temperature to attain carbon neutrality in China

Beiyao Xu et al.

Summary: China is committed to achieving carbon neutrality by 2060 and reducing emissions to mitigate air pollution. However, this may lead to higher air temperatures in certain regions. Regional emission reduction is the main factor affecting future air quality, while global climate change is the primary driver of future increases in air temperature.

ATMOSPHERIC RESEARCH (2022)

Article Environmental Sciences

Potential improvement in combustion and pollutant emissions of a hydrogen-enriched rotary engine by using novel recess configuration

Cheng Shi et al.

Summary: This study proposes a novel turbulence-induced blade (TIB) configuration for improving the combustion characteristics and controlling emissions of rotary engines. The results show that the introduction of TIB enhances turbulent flow, leading to significant improvements in indicated thermal efficiency and a notable impact on spark timing and rotor chamber pressure.

CHEMOSPHERE (2022)

Article Thermodynamics

Cooperative optimization strategy for large-scale electric vehicle charging and discharging

WanJun Yin et al.

Summary: This paper proposes a method to solve the optimal scheduling problem of large-scale electric vehicles connected to the grid. By considering multiple factors and using a high-confidence wind power scenario, the collaborative optimization of coal-fired power generation, wind power generation, and electric vehicles is achieved.

ENERGY (2022)

Article Thermodynamics

Multi-domain and Multi-scale model of a fuel cell electric vehicle to predict the effect of the operating conditions and component sizing on fuel cell degradation

Davor Rasic et al.

Summary: This paper presents a high-fidelity multi-domain and multi-scale model of a fuel cell electric vehicle, which can simulate the coupled phenomena from the vehicle level to intra-fuel cell level. The results demonstrate that this model enables the exploration of interactions between vehicle characteristics and intra-fuel cell spatio-temporal characteristics in the early stages of development. Therefore, this approach is significant for the virtualization of system-level design and front loading in the development process of fuel cell electric vehicles.

ENERGY CONVERSION AND MANAGEMENT (2022)

Article Energy & Fuels

Optimal control strategy of the turbocharged direct-injection hydrogen engine to achieve near-zero emissions with large power and high brake thermal efficiency

Ling-zhi Bao et al.

Summary: This study focuses on a 2.0 L turbocharged direct-injection engine and achieves large power, high thermal efficiency, and near-zero emissions through the combination of lean combustion and retarded ignition, along with an optimized control strategy.
Article Energy & Fuels

Computational study of hydrogen injection strategy on the combustion performance of a direct injection rotary engine fueled with natural gas/hydrogen blends

Baowei Fan et al.

Summary: This study investigates the impact of hydrogen injection timing and angle on the performance of NHBF rotary engine, with a dynamic model considering apex seal leakage established. Results indicate that setting HIA at +45 degrees and HIT at 155 degrees CA can improve combustion efficiency.
Article Thermodynamics

Numerical research on combustion and emissions behaviors of a medium compression ratio direct-injection twin-spark plug synchronous ignition methanol engine under steady-state lean-burn conditions

Changming Gong et al.

Summary: The study showed that optimal injection timing of 110 degrees crank angle before top dead center and ignition timing of 21 degrees crank angle before top dead center can achieve the best compromise for a medium compression ratio direct-injection twin-spark plug synchronous ignition methanol engine under steady-state lean-burn conditions. Twin-spark plug synchronous ignition can ensure stable combustion and yield good performance with a medium compression ratio under lean burn conditions.

ENERGY (2021)

Article Energy & Fuels

Effect of injection strategy on the mixture formation and combustion process in a gasoline direct injection rotary engine

Changwei Ji et al.

Summary: The study found that injection positions near the top dead center and increasing injection angles can change the rich zone of fuel and local equivalence ratio, with upper injection positions concentrating fuel near the spark plugs for better combustion and higher peak pressure.
Article Energy & Fuels

Influence of thermal barrier coating on partially premixed combustion in internal combustion engine

Tianyu Ma et al.

Summary: This paper investigates the influences of thermal barrier coating (TBC) on near wall combustion and pollutant distribution in Gasoline/Diesel RCCI and GCI combustion, showing that TBC can improve thermal efficiency and reduce unburned products and soot emissions, but increase NOx emissions in both combustion modes.
Article Energy & Fuels

Three-dimensional numerical simulations on the effect of ignition timing on combustion characteristics, nitrogen oxides emissions, and energy loss of a hydrogen fuelled opposed rotary piston engine over wide open throttle conditions

Jianbing Gao et al.

Summary: Ignition timing has a significant impact on engine performance, with early ignition resulting in increased fuel consumption and nitrogen oxides emissions, while late ignition leads to a higher percentage of exhaust energy in fuel chemical energy.
Article Thermodynamics

Implementation of 1D-3D integrated model for thermal prediction in internal combustion engines

X. Margot et al.

Summary: In this study, a 1D model integrated with 3D finite elements was used to calculate heat losses in a gasoline direct injection engine. The model was validated and compared with a full CFD-CHT simulation, showing its ability to accurately predict heat losses and temperature distribution in internal combustion engines in a short time.

APPLIED THERMAL ENGINEERING (2021)

Article Energy & Fuels

Stratified combustion characteristics analysis and assisted-ignition strategy optimization in a natural gas blended diesel Wankel engine

Wei Chen et al.

Summary: The study highlighted the importance of improving combustion performance in a diesel Wankel engine by investigating dual-fuel mixture formation and the effects of assisted-ignition timing and position on engine combustion characteristics. Results showed that using dual assisted-ignition spark plugs could enhance fuel burning rate and improve engine combustion performance, with a more concentrated mixture near spark plugs leading to increased pressure in-cylinder and combustion rate. Symmetrical arranged dual assisted-ignition spark plugs and ignition timing of 35°CA BTDC were identified as preferred practical application schemes, significantly increasing peak pressure in-cylinder compared to single spark plug ignition and different ignition timing schemes.
Article Energy & Fuels

Experimental and numerical study of combustion and emissions performance in a hydrogen-enriched Wankel engine at stoichiometric and lean operations

Cheng Shi et al.

Summary: Based on experimental and numerical simulations, the addition of hydrogen in a retrofitted Wankel engine was found to increase combustion temperature and pressure, optimizing combustion processes and improving engine stability. However, it also led to increased nitrogen oxide emissions, which could be mitigated by diluting the mixture.
Article Thermodynamics

A smart load-speed sensitive cooling map to have a high- performance thermal management system in an internal combustion engine

Alireza Naderi et al.

Summary: This paper presents a smart speed-load sensitive cooling map for internal combustion engines, optimizing cooling flow to achieve more uniform temperature distribution and reduce power consumption and radiator size, while increasing fuel consumption, hydrocarbon emission production, and coolant pump power.

ENERGY (2021)

Article Green & Sustainable Science & Technology

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

Jianbing Gao et al.

JOURNAL OF CLEANER PRODUCTION (2020)

Article Thermodynamics

Study of different cooling structures on the thermal status of an Internal Combustion Engine

Xiaoqiang Chen et al.

APPLIED THERMAL ENGINEERING (2017)

Article Green & Sustainable Science & Technology

Technology competition in the internal combustion engine waste heat recovery: a patent landscape analysis

Matti Karvonen et al.

JOURNAL OF CLEANER PRODUCTION (2016)

Article Thermodynamics

Sliding vane rotary pump in engine cooling system for automotive sector

Roberto Cipollone et al.

APPLIED THERMAL ENGINEERING (2015)

Article Transportation Science & Technology

Thermal Map of an IC Engine via Conjugate Heat Transfer: Validation and Test Data Correlation

Owais Iqbal et al.

SAE INTERNATIONAL JOURNAL OF ENGINES (2014)

Article Thermodynamics

A novel engine cooling system with two circuits operating at different temperatures

R. Cipollone et al.

ENERGY CONVERSION AND MANAGEMENT (2013)

Article Thermodynamics

Coupling conjugate heat transfer with in-cylinder combustion modeling for engine simulation

Yuanhong Li et al.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2011)

Article Mechanics

A general solution of unsteady Stokes equations

A Venkatalaxmi et al.

FLUID DYNAMICS RESEARCH (2004)