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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.1; 20051026-28; Nanjing(CN) >Application of Unstructured Grids on the Research of Perforated Shock Tube Jet Flow
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Application of Unstructured Grids on the Research of Perforated Shock Tube Jet Flow

机译：非结构网格在穿孔管冲击射流研究中的应用

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摘要

A type of shock tube pierced with vents and assembled at the end of a shock tube device can be used to mitigate the recoil. However the application of the perforated shock tube also causes unfavourable overpressure and noise. To reduce the overpressure several shock tubes are studied in this article. Generally there are two ways to study the jet flow, numerical simulation and experiment. The structure of the shock tube is so complicated for numerical simulation that it is very difficult and time consuming to generate constructed grids for the computing domain. As a result, unstructured grids were applied in this article. The gases are supposed to be inviscid and chemical reaction is neglected. Firstly, a shock tube was tested with CFD code and experiment study, good agreement was seen in the comparison of the results. Then, the code is used to analyse a type of two-part perforated shock tubes. There are many holes on the inner part and several strip-like vents sloped rearward on the outer part of the model. The two parameters, slope angle of holes and reflect area of baffle, are studied to show their effect on the performance of shock tubes. Firstly, several perforated shock tubes with different hole slope angles are designed and tested with the CFD code. Then a better one is taken out to increase the reflect area of the baffle. The shock tube jet flow of the improved shock tube is simulated and the energy efficient is also obtained. Simulation results indicate the energy efficiency will be higher when the holes are sloped to the free end of the barrel with little increase in the value of overpressure. Higher energy efficiency and lower overpressure can be got when the chamber between the two parts is divided into several to increase the area of baffles.
机译：可以在通气管装置的末端使用一种穿有通气孔的通气管来减轻后坐力。但是，带孔减震管的使用也会导致不利的过压和噪音。为了减少过压，本文研究了几种减震管。通常，有两种方法研究射流，数值模拟和实验。冲击管的结构对于数值模拟而言是如此复杂，以至于为计算域生成构造的网格非常困难且耗时。结果，本文应用了非结构化网格。该气体被认为是无粘性的，而化学反应被忽略了。首先，用CFD代码对减震管进行了测试，并进行了实验研究，结果进行了比较。然后，该代码用于分析一种类型的两部分式穿孔减震管。模型的内部有很多孔，模型的外部有向后倾斜的几个条状通风口。研究了孔的倾斜角和挡板的反射面积这两个参数，以显示它们对减震管性能的影响。首先，使用CFD代码设计和测试了几种具有不同孔斜角的穿孔减震管。然后取出更好的一个，以增加挡板的反射面积。模拟了改进后的冲击管的冲击管射流，并获得了能效。仿真结果表明，当孔向桶的自由端倾斜时，过压值几乎没有增加，能量效率将更高。将两部分之间的腔室分成几部分以增加挡板的面积，可以获得更高的能源效率和更低的超压。

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