Title:
SOUND VELOCITY SUSTAINING RANGE DETECTOR FOR SOUND VELOCITY NOZZLE
Document Type and Number:
Japanese Patent JP3406371
Kind Code:
B
Abstract:
PURPOSE: To detect the sound velocity sustaining range of a sound velocity nozzle through a simple detector.
CONSTITUTION: A supporting plate 3 is held between an upstream side flow pipe 1 and a downstream side flow pipe 2 for passing gas in the direction of arrow Q and a sound velocity nozzle 4 is fixed to the supporting plate 3. A microphone 5 is mounted on the wall of the upstream side flow pipe 1 and when the velocity of gas flowing through the nozzle 4 reaches a sound velocity sustaining range, sound wave generated from the nozzle 4 does not reach the microphone 5. Consequently, the sound pressure level detected by the microphone 5 varies abruptly at the border of critical pressure ratio and noncritical pressure ratio of the sound velocity nozzle 4. The variation is compared with a reference voltage 8 thus determining the sound velocity sustaining range.
Inventors:
Nakao, Yuichi
Application Number:
JP1994000073583
Publication Date:
March 07, 2003
Filing Date:
April 12, 1994
Export Citation:
Assignee:
OVAL CORP
International Classes:
G01F1/34; G01F25/00; G01F1/34; G01F25/00; (IPC1-7): G01F25/00; G01F1/34
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