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Hypersonic application of focused schlieren and deflectometry.

機(jī)譯：高超音速技術(shù)的聚焦擺線和偏轉(zhuǎn)測(cè)量。

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摘要

A non-intrusive diagnostic capability for determining the hypersonic shock and boundary layer structure was developed, installed, and successfully tested at the AEDC Hypervelocity Tunnel 9. This customized diagnostic involves a combination of a focused schlieren system, which relies on creating multiple virtual light sources using a Fresnel lens and a source grid, and a deflectometry system, which uses the focused schlieren and a photomultiplier tube. It was used for obtaining spatially resolved images of density gradients with a depth of focus less than one centimeter, while allowing high frequency measurements of density fluctuations. The diagnostic was applied in investigating the second mode instability waves present in the boundary layer of a sharp-nosed cone submerged in a Mach 10 flow. The waves were successfully imaged and their frequencies were measured even though the flow density was below 0.01 kgm3 and the frequencies over 200 kHz. This adds a new capability to hypersonic testing.
機(jī)譯：在AEDC超高速隧道9上開(kāi)發(fā)，安裝并成功測(cè)試了用于確定高超音速?zèng)_擊和邊界層結(jié)構(gòu)的非侵入式診斷功能。這種定制的診斷涉及集中的schlieren系統(tǒng)的組合，該系統(tǒng)依賴于創(chuàng)建多個(gè)虛擬光源使用菲涅耳透鏡和源柵，以及偏轉(zhuǎn)系統(tǒng)，該系統(tǒng)使用聚焦的schlieren和光電倍增管。它用于獲得焦點(diǎn)深度小于一厘米的密度梯度的空間分辨圖像，同時(shí)允許對(duì)密度波動(dòng)進(jìn)行高頻測(cè)量。該診斷方法用于調(diào)查浸沒(méi)在10馬赫流中的尖頭圓錐體邊界層中的第二模式不穩(wěn)定性波。即使流量密度低于0.01 kgm3，頻率超過(guò)200 kHz，也可以對(duì)波進(jìn)行成功的成像并測(cè)量其頻率。這為高超聲速測(cè)試增加了新功能。

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  • 作者

    VanDercreek, Colin Paul.;

  • 作者單位

    University of Maryland, College Park.;

  • 授予單位 University of Maryland, College Park.;
  • 學(xué)科 Engineering Aerospace.;Physics Optics.
  • 學(xué)位 M.S.
  • 年度 2010
  • 頁(yè)碼 130 p.
  • 總頁(yè)數(shù) 130
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類
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