Turbine-based combined-cycle inlet mode transition opertation conditions and transition schemes
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摘要:
为实现组合动力推进系统(TBCC)平稳的模态转换,采用风洞试验和数值仿真方法开展了TBCC进气道模态转换过程分流模式及分流策略研究。提出了将组合动力进气道模态转换过程工作状态分为超声分流、超/亚声分流以及亚声分流3种模式,并给出不同分流模式的判断依据。根据不同分离模式涡轮和冲压通道所能承受的极限背压,构建了包含3种分流模式的进气道模态转换工作区。基于模态转换工作区,给出了两种模态转换分流策略。结果表明:模态转换过程,涡轮通道超声分流模式极限背压从32倍减小至13倍,冲压通道极限背压从16倍增大到32倍;超声分流模式两个通道的流量和涡轮/冲压通道的入口面积成正比,一旦进入超/亚声分流模式,两个通道之间将发生气动耦合现象,在模态转换40%~60%时,涡轮通道流量系数比超声分流降低12%,冲压通道流量系数增大7%。
Abstract:To achieve smooth mode transition of turbine-based combined-cycle (TBCC) propulsion system, the transition operation modes and transition schemes of TBCC inlet were investigated through wind tunnel test and numerical simulations. Three transition operation modes of TBCC inlet, including supersonic operation mode, supersonic/subsonic operation mode and subsonic mode, and the criteria for different operation modes were put forward. Then the operation zone, which included the three transition operation modes of inlet mode transition, was established according to the maximum backpressure of turbojet and ramjet flowpath at different modes. Two mode transition schemes were presented based on the operation zone. The results indicated that during TBCC inlet mode transition, the maximum backpressure of the turbojet flowpath of supersonic operation mode decreased from 32 times to 13 times, while it increased from 16 times to 32 times for the ramjet flowpath. The mass flow into two flowpath was changed linearly to the entrance area of turbojet/ramjet flowpaths during supersonic mode transition. Once the inlet operated in supersonic/subsonic mode during mode transition, aerodynamic coupling between two flowpath occurred. During mode transition from 40% to 60%, mass flow ratio of the turbojet flowpath decreased by 12% compared with supersonic operation mode and increased by 7% for the ramjet flowpath.
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表 1 进气道超/亚声分流模式下相关截面马赫数
Table 1. Mach number of critical section at supersonic/subsonic opertation conditions
高背压
来源出口
背压马赫数 喉道 涡轮进口 冲压进口 冲压通道 30.5 1.257 0.791 1.218 涡轮通道 27 1.003 0.756 1.029 表 2 进气道亚声分流模式下相关截面马赫数
Table 2. Mach number of critical section of subsonic opertation conditions
涡轮
背压冲压
背压马赫数 喉道 涡轮进口 冲压进口 27 30.5 1.009 0.756 1.029 27.5 31 0.960 0.766 0.954 28 31.5 0.813 0.755 0.831 -
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