作为飞机环控系统与主发动机起动的气源,以目前广泛应用的带负载压气机结构APU(Auxiliary Power Unit)为研究对象,进行引气特性计算模型与计算方法研究。首先介绍了APU结构与引气工作特点,然后分析了建模时喘振控制阀SCV(Surge Control ...作为飞机环控系统与主发动机起动的气源,以目前广泛应用的带负载压气机结构APU(Auxiliary Power Unit)为研究对象,进行引气特性计算模型与计算方法研究。首先介绍了APU结构与引气工作特点,然后分析了建模时喘振控制阀SCV(Surge Control Valve)控制方法与APU共同工作机理,最后采用部件法建立了该类型APU引气计算数学模型。以某型APU为对象进行数值仿真并与实际试车数据比较,计算误差小于3%,表明所采用的建模方法是正确的,所建立的模型能够满足工程需求。展开更多
Bleeding in the compressor is getting more and more attractive because the increasing demand of bleeding rate as the temperature of the first stage of turbine gets higher and needs more cooling air.Though plenty of wo...Bleeding in the compressor is getting more and more attractive because the increasing demand of bleeding rate as the temperature of the first stage of turbine gets higher and needs more cooling air.Though plenty of work has been done about bleeding,however,most of the work is studied with a single passage or ignoring the real structure of the bleeding system.In the present study,multi-passage calculation was used through ANSYS CFX to consider the finite duct holes in the whole blade row,and the effect of the axial location of bleeding slot on the non-uniformity of the blade passage was investigated,and the non-uniform could maintain a low level when bleeding at the front part of the blade passage and the non-uniformity would become large when moving the bleeding slot much further downstream.Afterward,the air bleeding mass flow rate was studied.It’s found that the non-uniformity of air bleeding mass flow is small when bleeding at a low mass flow rate in each passage and results in relatively uniform flow field in the passage.However,the non-uniformity increases significantly as the bleeding mass flow rate increases.Some flow field details were also given to study how the flow field changes when bleeding non-uniformly.展开更多
基金supported by the National Natural Science Foundation of China (No. 51676007, No. 51376001, No. 51420105008)supported by the China Scholarship council (CSC)
文摘作为飞机环控系统与主发动机起动的气源,以目前广泛应用的带负载压气机结构APU(Auxiliary Power Unit)为研究对象,进行引气特性计算模型与计算方法研究。首先介绍了APU结构与引气工作特点,然后分析了建模时喘振控制阀SCV(Surge Control Valve)控制方法与APU共同工作机理,最后采用部件法建立了该类型APU引气计算数学模型。以某型APU为对象进行数值仿真并与实际试车数据比较,计算误差小于3%,表明所采用的建模方法是正确的,所建立的模型能够满足工程需求。
基金supported by the National Natural Science Foundation of China (Grant Nos. 51776048 and 51436002)
文摘Bleeding in the compressor is getting more and more attractive because the increasing demand of bleeding rate as the temperature of the first stage of turbine gets higher and needs more cooling air.Though plenty of work has been done about bleeding,however,most of the work is studied with a single passage or ignoring the real structure of the bleeding system.In the present study,multi-passage calculation was used through ANSYS CFX to consider the finite duct holes in the whole blade row,and the effect of the axial location of bleeding slot on the non-uniformity of the blade passage was investigated,and the non-uniform could maintain a low level when bleeding at the front part of the blade passage and the non-uniformity would become large when moving the bleeding slot much further downstream.Afterward,the air bleeding mass flow rate was studied.It’s found that the non-uniformity of air bleeding mass flow is small when bleeding at a low mass flow rate in each passage and results in relatively uniform flow field in the passage.However,the non-uniformity increases significantly as the bleeding mass flow rate increases.Some flow field details were also given to study how the flow field changes when bleeding non-uniformly.
