Abstract
As the main adjusting means of the total pressure for the continuous transonic wind tunnel, the characteristics of regulating valve directly affect the flow field performance of the wind tunnel, therefore, it is important to analyze and establish the correlation between the regulating valve and the total pressure, and it is necessary to select the appropriate regulating valve and its combination accordingly. Firstly, in terms of the pressure regulation principle of the wind tunnel pressure regulating system, combining with the flow characteristics of the regulating valve, the correlation between the position control of the regulating valve and the total pressure control of the wind tunnel is established, then the static test is conducted to verify the relationship. In order to shorten the flow field stability time under the negative pressure of 0.6m continuous transonic wind tunnel, based on the established theory, the valve system is optimized and reformed, and the blowing test is carried out. The results show that the time of optimized Mach number polar curve decreases by 40%~50%, which greatly improves the test efficiency, which further proves that the present analysis is correct and effective, and can provide reference for the design of pressure regulating system in continuous transonic wind tunnel.
Highlights
用于试验的抽真空调节阀执行器型号为罗托克 IQML18,调节阀全行程(0 ~ 100%开度) 时间为 98 s。 分别测试执行器在 0.5%,0.6%,1.0%精度下稳态调 节时 对总压的影响, 测试目标压力为 50 kPa 和 20 kPa,测试结果分别见图 3 和图 4。
The results show that the time of optimized Mach number polar curve decreases by 40% ~ 50%, which greatly improves the test efficiency, which fur⁃ ther proves that the present analysis is correct and effective, and can provide reference for the design of pressure regulating system in continuous transonic wind tunnel
Summary
用于试验的抽真空调节阀执行器型号为罗托克 IQML18,调节阀全行程(0 ~ 100%开度) 时间为 98 s。 分别测试执行器在 0.5%,0.6%,1.0%精度下稳态调 节时 对总压的影响, 测试目标压力为 50 kPa 和 20 kPa,测试结果分别见图 3 和图 4。 6%; 另 一 款 IQML20,全行程时间 25 s,精度 1.6%。 测试目标压 力为 50 kPa,为确保稳态调节时位于不同调节区间, 需要通过开启进气调节阀,预置不同的进气阀开度 来实现。 测试结果分别见图 5 和图 6。 图 5 同图 3 的处理方法一致,将 2 个不同车次, 稳态调节时的总压波动曲线绘制于同一坐标轴,2 条曲线均为采用 IQML18 调节阀在 50 kPa 稳态调节 时的压力波动曲线。 其中调节区间为 30% 曲线的 上下限波动为 28 Pa 和 - 26 Pa 图 6 中 2 条曲线为采用 IQML20 调节阀执行器,在不同调节区间下进行 50 kPa 稳态调节时 2 个
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