- local sonic speed
- 局部声速
English-Chinese dictionary of mechanical engineering (英汉机械工程大词典). 2013.
English-Chinese dictionary of mechanical engineering (英汉机械工程大词典). 2013.
sonic speed — The local speed of sound. In the international standard atmosphere (ISA), sound travels at 761.6 mph, 1116 ft/s, 340.5 m/s, 661.7 knots, 34,046.16 cm/s, or 1225.5 km/h. The speed of sound decreases with altitude, and above the tropopause its… … Aviation dictionary
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sound barrier — 1. Also called sonic barrier, transonic barrier. (not in technical use) a hypothetical barrier to flight beyond the speed of sound, so postulated because aircraft undergo an abruptly increasing drag force induced by compression of the surrounding … Universalium
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Cylinder head porting — refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve the quality and quantity of the air flow. Cylinder heads, as manufactured, are usually suboptimal due to design and manufacturing… … Wikipedia