與普通離心泵相比，發(fā)動機冷卻水泵由于受溫度、工況、轉(zhuǎn)速變化的影響，更容易發(fā)生汽蝕汽蝕發(fā)生時伴隨有振動和噪聲，泵的揚程、效率等性能急速下降，*在汽蝕工況下運行，葉輪將受到氣泡潰滅時的強力沖擊而侵蝕，甚至穿孔損壞。發(fā)動機冷卻水泵葉片表面的蜂窩狀坑點、蝸殼隔舌附近的凹坑都是常見的汽蝕破壞。
上海祥樹FLENDERZAPEX ZNN156
上海祥樹FLENDERZAPEX ZNN156
上海祥樹FLENDERZAPEX ZNN156
此外，發(fā)動機冷卻水泵的汽蝕還將會腐蝕破壞過流部件，加速部件失效等。發(fā)動機冷卻水泵汽蝕破壞已成為縮短泵使用壽命、產(chǎn)生振動噪聲等危害的重要因素，嚴重影響著汽車冷卻系統(tǒng)的正常工作。因此，提高其抗汽蝕性能是保證冷卻系統(tǒng)可靠運行首先需要考慮的問題。
發(fā)動機冷卻水泵惡劣的工作環(huán)境，使得泵的可靠性和汽蝕破壞問題尤其突出，嚴重影響著冷卻系統(tǒng)的安全、穩(wěn)定、可靠地運行。探討如何提高發(fā)動機冷卻水泵的可靠性、研究汽蝕機理對發(fā)動機冷卻系統(tǒng)的發(fā)展意義重大 。
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