Browsing by Author "Chen, Yuchun"

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    Modelling and performance analysis of vaneless counter rotating turbine in gas turbine engines
    (ISABE, 2017-09-08) Jia, Linyuan; Chen, Yuchun; Gao, Yuan; Zhao, Junjie
    The objective of this article is to develop a method for 1+1/2 type vaneless counter rotating turbine (VCRT) modelling in gas turbine engines and to analyse the influence of the VCRT on a turbofan engine. By studying the off-design features of the VCRT, a new method to describe the VCRT characteristic map was established. The new turbine maps were integrated into the gas turbine performance simulation model based on component maps. The throttle performance of a low bypass counter rotating turbofan engine was simulated and the results were validated with engine test data. The validation results show that the new method improves the accuracy of the VCRT engine performance simulation. The influence of the VCRT on the engine steady state performance was illuminated by comparing the performance of a VCRT engine with that of a conventional engine. Under low engine load conditions, the insufficient work capacity of the VCRT low pressure turbine was detected due to the decrease of both its efficiency and pressure ratio. Consequently, the VCRT engine’s turbine inlet temperature, fan rotating speed, mass flow rate and engine thrust decreased while its specific fuel consumption increased compared to that of a conventional engine.
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    Research on quantitative evaluation method of scramjet and integration
    (ISABE, 2017-09-08) Zhang, Huanrong; Chen, Yuchun; Cai, Yuanhu; Zhao, Junjie
    The objective of this paper is to develop a method for the advancement quantitative evaluation of scramjet and hypersonic vehicle/scramjet integration. By studying the theory of analytic hierarchy process (AHP), a new method to build the quantitative evaluation system was established. The theory of Nondimensional parameter was also proposed and the results showed that this calculation method is scientific and effective. Both the numerical simulations of the advancement quantitative evaluation of scramjet and hypersonic vehicle/scramjet integration were carried out with a number of calculation examples and the advancements of different projects were obtained, which proved the feasibility and reliability of the evaluation method. This quantitative evaluation method simples the complex problems of scramjet and integration evaluation and lays the foundation for the further research of hypersonic technology.