The calculation method and performance provide important basis for full use of the piston wind.
活塞风的计算方法和特性为活塞风的充分利用提供了重要依据。
This paper attempts to establish a calculating formula of piston wind velocity in tunnel with double shafts to solve this problem.
本文试图通过建立双竖井隧道的活塞风计算公式，以解决双竖井隧道空气阻力计算的困难。
The calculated piston wind velocity accords with the measured result on site through making a comparison with tunnel aerodynamic test data of real vehicles.
以实车的隧道空气动力学试验资料为参照进行对比计算，计算活塞风速度与实测结果较好符合。
Natural ventilation that made use of piston wind induced by metro operation at the top opening of metro tunnel is a possible means of ventilation technology.
在地铁区间隧道顶部开孔，利用地铁列车运行产生的“活塞风”进行自然通风换气是一种可能的通风技术手段。
Isentropic light piston wind tunnel is a kind of short working duration tunnel. It is adequate to be used for the research work of instantaneous heat transfer measurement.
等熵轻质活塞风洞是一种工作时间很短的风洞，作为气源适合于瞬时热传导测量技术的研究工作。
It is very complex to calculate the aerodynamic drag of high-speed train running in railway tunnel with multi -shafts. And the difficulty is to calculate the velocity of piston wind.
在高速列车空气阻力计算中，多竖井隧道的列车空气阻力计算比较复杂，其难点在于多竖井的活塞风计算。
Our main products include pin, block, piston and sleeve, which are mainly used in engineering machine, wind generator and food package machine.
主要产品为销轴，阀块，活塞，衬套等，主要应用于工程机械，风力发电机，食品包装机械三个领域。
This machine VF-6/7 is of V model, double-row, double-step, wind cooling, fixed reciprocating piston type air compressor.
本机型为V型、两列、两级、风冷的固定式往复活塞空气压缩机。
After the study, further recongniztion are done to flow characteristics of high enthalpy free piston shock wave wind tunnel.
研究表明：由于粘性相互作用，高焓激波风洞实验段平板静压测量值远高于实际自由流静压。
After the study, further recongniztion are done to flow characteristics of high enthalpy free piston shock wave wind tunnel.
研究表明：由于粘性相互作用，高焓激波风洞实验段平板静压测量值远高于实际自由流静压。
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