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Performance of the Active Sidewall Boundary-Layer Removal System for the Langley 0.3-Meter Transonic Cryogenic Tunnel

Performance of the Active Sidewall Boundary-Layer Removal System for the Langley 0.3-Meter Transonic Cryogenic Tunnel

          
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About the Book

A performance evaluation of an active sidewall boundary-layer removal system for the Langley 0.3-m Transonic Cryogenic Tunnel (TCT) was evaluated in 1988. This system uses a compressor and two throttling digital valves to control the boundary-layer mass flow removal from the tunnel. The compressor operates near the maximum pressure ratio for all conditions. The system uses a surge prevention and flow recirculation scheme. A microprocessor based controller is used to provide the necessary mass flow and compressor pressure ratio control. Initial tests on the system indicated problems in realizing smooth mass flow control while running the compressor at high speed and high pressure ratios. An alternate method has been conceived to realize boundary-layer mass flow control which avoids the recirculation of the compressor mass flow and operation near the compressor surge point. This scheme is based on varying the speed of the compressor for a sufficient pressure ratio to provide needed mass flow removal. The system has a mass flow removal capability of about 10 percent of test section flow at M = 0.3 and 4 percent at M = 0.8. The system performance has been evaluated in the form of the compressor map, and compressor tunnel interface characteristics covering most of the 0.3-m TCT operational envelope. Balakrishna, S. and Kilgore, W. Allen and Murthy, A. V. Unspecified Center NAS1-17919; RTOP 505-61-01-09...


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Product Details
  • ISBN-13: 9781728930619
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 280 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 216 mm
  • ISBN-10: 1728930618
  • Publisher Date: 18 Oct 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr


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Performance of the Active Sidewall Boundary-Layer Removal System for the Langley 0.3-Meter Transonic Cryogenic Tunnel
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