narrow outlet 中文意思是什麼
narrow outlet
解釋
銷路呆滯-
First super - low specific - speed centrifugal pump has a long and narrow flow passage for its high head and low capacity, and the power absorbed by disc friction is too high, so the efficiency is very low ; secondly the diffusion of flow passage is so high, that the reserved flow often emerges at the inlet and outlet of impeller. therefore the h ~ q characteristic curve is often hump - shaped, and at the low - capacity operating condition the instability often occurs ; thirdly the centrifugal pump at high - capacity operating condition is easy to overload because the n ~ q curve appears a rising trend
首先由於它的揚程較高、流量較小，所以它的流道狹長，圓盤摩擦損失較大，效率相對較低；其次由於它的流道擴散較嚴重，易在葉片進口產生迴流和在出口產生脫流，揚程流量特性曲線易出現駝峰，在小流量工況下易產生不穩定現象；第三，由於其功率流量曲線呈現上升趨勢，在大流量區運行時電機易過載。 -
The railway track wound in and out among the passes, now approaching the mountain sides, now suspended over precipices, avoiding abrupt angles by bold curves, plunging into narrow defiles, which seemed to have no outlet
它忽而貼在山腰，忽而在懸崖上前進，有時為了避免急轉彎，它的曲度大得驚人，有時伸入兩山對峙的狹谷里，使人頗有「山窮無路」之感。 -
Mrs. fairfax stayed behind a moment to fasten the trap - door ; i, by dint of groping, found the outlet from the attic, and proceeded to descend the narrow garret staircase
費爾法克斯太太比我晚走一會兒，拴上活動天窗。我摸索著找到了頂樓的出口，並爬下狹窄頂樓的扶梯。
分享友人