Shock Tube Test Time Limitation Due to Turbulent-Wall Boundary Layer
Shock Tube Test Time Limitation Due to Turbulent-Wall Boundary Layer
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湍流壁边界层引起的激波管测试时间限制
DOI：
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发表时间：
1964
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影响因子：
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通讯作者：
H. Mirels
中科院分区：
文献类型：
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作者：
H. Mirels
激波管试验时间限制由于过早的接触表面是完全turbulent-wall边界层分析调查的结果与完全laminar-wall边界层发现,对于给定的冲击马赫数女士,最大可能的测试时间(在一个长激波管)变化和d 6 / / 4 p co1/4 d2p CD紊流和层流情况下,分别(d =管直径,p oo =初始压力)对3 ^ 5,而层流理论大致适用于DPM ~ 1 （d为英寸）；当dp»5时，空气和氩气的湍流理论表明，测试次数约为xs/d = 45至150时理想值的一半至四分之一（xs =低压段长度）。dp»值越高，测试时间越长。层流理论表明，当x /d ~ 100时，理想试验时间约为理想试验时间的一半。较低的dpm可减少试验时间，给出了在特定情况下更准确估计试验时间的工作曲线。在长激波管内，当层流和湍流边界层的Ms分别< 12和Ms < 3时，会发生边界层关闭
Shock tube test time limitation due to the premature arrival of the contact surface is analytically investigated for wholly turbulent-wall boundary layers The results are compared with those for wholly laminar-wall boundary layers It is found that, for a given shock Mach number Ms, the maximum possible test time (in a long shock tube) varies as d 6//4p co1/4 and d2p CD for the turbulent and laminar cases, respectively (d = tube diameter, p oo = initial pressure) For 3 ^ 5, whereas the laminar theory applies, roughly, for dpm ~ 1 (d is in inches; pm is in centimeters of mercury) When dp » 5, turbulent theory for both air and argon indicates test times of about one-half to one-fourth the ideal value for xs/d = 45 to 150, respectively (xs = length of low-pressure section) Higher values of dp » result in more test time When dpm ~ 0 5, laminar theory indicates about one-half ideal test time for xs/d ~ 100 Lower dpm reduces test time Working curves are presented for more accurate estimates of test time in specific cases Boundary-layer closure occurs, in long shock tubes, when Ms < 1 2 and Ms < 3 for laminar and turbulent boundary layers, respectively