Regular Analysis of Aero-Diesel Piston Engine between Combustion Chamber Size and Emission

Pan, Zhongjian; Yu, Dao‐Yi; Cheng, Lizhi

doi:10.1155/2019/8690906

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…Xue M established the simulation model of in-cylinder combustion of piston aviation and verified by experiments, which state that the combustion center of gravity will increase by increasing the ignition advance angle [23]. Pan Z J et al analyzed the impact of combustion chamber diameter and depth on emissions, which showed that properly reducing combustion chamber diameter and diameter-depth ratio can reduce emissions [24].…”

Section: Introductionmentioning

confidence: 99%

Study of Scavenging and Combustion Processes for Small Two-Stroke Aviation Heavy Fuel Direct Injection Engines

et al. 2023

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Heavy-fuel aviation piston engines (HF-APEs) are widely used in general aviation and unmanned aerial vehicle (UAV) due to their safety and fuel economy. This paper describes a numerical and experimental study of scavenging and combustion processes on a 2-Stroke Direct Injected HF-APEs for light aircraft, with its cylinder specifically designed as cross scavenging. A 3-Dimentional transient model of in-cylinder flow and combustion process is established by the Forte platform, and the engine test system is set up. By comparing the simulation results to the experimental results, it showed that multi-ports cross scavenging can generate unbalanced aerodynamic torque in the cylinder. In the compression process, the swirl ratio (SR) gradually increases, and the peak SR reaches 15. Moreover, approximately 25% of exhaust residual gas in the cylinder is conducive to the fuel atomization and evaporation process in a high-altitude environment. When the injection timing is between −8 °CA and −16 °CA, the engine has the optimal power and economy performance at different altitudes. Finally, when the injection advance angle moves forward by 4 °CA, the maximum pressure increases by 2 MPa, with the rising rate decreasing gradually. The results have important significance for the development of the combustion system of small 2-Stroke Direct Injected HF-APEs.

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Section: Introductionmentioning

confidence: 99%

Study of Scavenging and Combustion Processes for Small Two-Stroke Aviation Heavy Fuel Direct Injection Engines

et al. 2023

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“…In the design process of aviation heavy fuel piston engine, under the influence of compression ignition mode and under high cylinder pressure, the engine block needs to overcome the explosion pressure and high temperature generated during engine operation, and the body needs good strength and stiffness to ensure the safety and reliability of the engine (Pan and He, 2015). At present, the conventional method to enhance the engine block stiffness is to enhance the body wall thickness or replace high-strength materials, but replacing the lightweight high-performance materials will increase the cost of the engine (Pan and Guo, 2019; Pan et al , 2019), usually choose to increase the thickness or use cast iron materials to improve the stiffness. As the engine needs to carry the aircraft to fly off the ground, reducing the weight of the engine can reduce the weight of the aircraft.…”

Section: Introductionmentioning

confidence: 99%

Structural efficiency of block for aviation piston heavy fuel engine

Pan

Yang

2022

AEAT

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Purpose High reliability and high power-to-weight ratio are the technical difficulties in the development of aviation piston heavy fuel engines. This paper aims to provide a design evaluation method of the aero piston engine block, which can help R&D personnel quickly evaluate the performance of engine block, including effective bearing capacity and fatigue deformation, save a lot of experimental time and shorten the R&D cycle. Design/methodology/approach In this paper, structural efficiency is used to evaluate the reliability and durability of the engine block. Structural efficiency is a new evaluation method that lists its corresponding connotation according to different objects. In this paper, the function of the engine block in the engine is explained in detail, and three quantifiable connotations of the structural efficiency of the engine block are put forward. In the subsequent calculation, the calculation is carried out according to the three indexes, and the calculation results are used as the indexes to evaluate the performance of the engine block. Findings The structural efficiency evaluation method proposed in this paper can quickly and effectively evaluate the performance of the block from many aspects. Under the same boundary conditions, the two design schemes are simulated and analyzed, and the durability test is carried out. The analysis and experimental results show that Scheme 2 has good performance, which verifies the feasibility of the evaluation method. Originality/value This paper provides a method for rapid evaluation of engine block performance.

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“…Because of the military's single standard on fuel and the economy and availability for civil use, the compression ignition aviation piston engine has become a hot research topic [1]. Compared with jet engines, compression ignition piston-propeller aircraft has better fuel economy [2], low noise [3], emission, and easy maintenance. The unmanned aerial vehicle (UAV) needs a long hovering time; the engine is required to have high fuel economy, but the jet engine cannot meet this requirement.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of the Pin Bore of the Combined Piston for the Aero Engine

Pan

Guo

2019

International Journal of Aerospace Engineering

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The combined piston can be used in an aero piston heavy fuel engine because of its light weight, so as to reduce the reciprocating inertia force and improve the engine power-weight ratio. However, the pin bore of the combined piston is prone to deform leading to the failure of the piston. Based on the structure of the piston, the stress of the piston under thermomechanical coupling is analyzed, the temperature field of the piston is determined by experiments, and the deformation rule of the piston pin bore under the thermomechanical coupling is summarized. A design scheme is proposed to change the position of the thread connection between the piston crown and the piston head. Under the same conditions, the deformation of the piston pin bore of the original scheme and the new scheme is analyzed. The results show that together with the changing of the connection thread between the piston crown and the piston head, the deformation of the piston pin bore decreases by 60 μm and the deformation of the piston pin bore is controlled. The test results show that the deformation of the pin bore is within the acceptable range, which proves the effectiveness of the improved scheme.

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Regular Analysis of Aero-Diesel Piston Engine between Combustion Chamber Size and Emission

Cited by 5 publications

References 23 publications

Study of Scavenging and Combustion Processes for Small Two-Stroke Aviation Heavy Fuel Direct Injection Engines

Study of Scavenging and Combustion Processes for Small Two-Stroke Aviation Heavy Fuel Direct Injection Engines

Structural efficiency of block for aviation piston heavy fuel engine

Failure Analysis of the Pin Bore of the Combined Piston for the Aero Engine

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