Abstract: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 … Show more
The aluminum alloy block is a component of aircraft piston engine, and it is prone to fatigue cracks when working in a thermal mechanical coupling state for a long time. Establish a GT-POWER simulation model for a certain type of engine, verify the accuracy of the model, obtain boundary parameters such as temperature and pressure of the engine block under harsh operating conditions through the model, and divide the cylinder wall into gradients based on the engine operating conditions to obtain the surface heat transfer coefficient of the block, and then obtain the temperature field distribution of the engine body. The coupling analysis of the cylinder burst pressure and temperature field of the engine block under harsh working conditions showed that the maximum stress of the engine block was 292.55 MPa and the maximum deformation was 0.39 mm, with thermal load being the main factor causing deformation. Conduct a complete engine bench test, and under the 1000 h bench durability test, there are no cracks on the engine block, indicating that the design and analysis meet the requirements.
The aluminum alloy block is a component of aircraft piston engine, and it is prone to fatigue cracks when working in a thermal mechanical coupling state for a long time. Establish a GT-POWER simulation model for a certain type of engine, verify the accuracy of the model, obtain boundary parameters such as temperature and pressure of the engine block under harsh operating conditions through the model, and divide the cylinder wall into gradients based on the engine operating conditions to obtain the surface heat transfer coefficient of the block, and then obtain the temperature field distribution of the engine body. The coupling analysis of the cylinder burst pressure and temperature field of the engine block under harsh working conditions showed that the maximum stress of the engine block was 292.55 MPa and the maximum deformation was 0.39 mm, with thermal load being the main factor causing deformation. Conduct a complete engine bench test, and under the 1000 h bench durability test, there are no cracks on the engine block, indicating that the design and analysis meet the requirements.
The high-performance piston has a great impact on the performance parameters of the engine. The rapid design of a high-performance piston can shorten the research and development cycle and lower the experimental cost. At present, the piston design is mostly considered from a single factor, but it has not been comprehensively designed from multiple factors. Starting from the concept of structural efficiency, this paper defines the restrictive factors affecting engine performance parameters in piston design, puts forward an evaluation method of quantifying the benefit of piston design on engine performance parameters, and deduces the calculation model. The piston is designed and iterated many times to obtain the best two schemes. The two schemes are quantitatively compared through the above calculation model and verified by experiments. The results show that the structural efficiency of the piston in scheme 2 is 4.6% higher than that in scheme 1. The calculation method is applicable to the design of key engine components, which can shorten the research and development cycle, save the test costs, and greatly improve the R&D efficiency.
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