轴流式风机喘振,失速测点如何选取

2025-03-15 15:08:43
推荐回答(1个)
回答1:

喘振是轴流风机运行中的特殊现象。风机喘振的原因是出口压力与风机风量失去对应。出口压力很高而风量很小使得风机叶片部分或全部进入失速区。造成风机喘振最常见的因素是挡板误动、控制系统故障、运行人员误操作。风机喘振主要表现为:风量、出口风压、电机电流出现大幅度波动,剧裂振动和异常噪音:喘振会造成风机叶片断裂或机械部件损坏,严禁风机在喘振工况下运行。运行中一旦发现风机进入喘振区,应立即调整风机动叶角度,使得风机运行点避开喘振区。风机喘振跟动叶角度有很大关系,动叶角度越小,越易发生喘振失速是叶片结构特性造成的一种空气动力工况。失速的基本特性由开始至结束都有它自身的规律,不受系统容积形状影响,而喘振是风机与系统耦合后的振荡特性的表现形式,其振幅、频率等受风道容积的节制失速是轴流式风机或离心式空压机基本属性,每个叶轮都会有发生失速的不稳定工况,它是隐形的,只有用高灵敏度仪器,高频测试器才能探测。而喘振是显形的。当喘振发生时,流量、压力和功率的脉动及伴随的噪声,一般很明显,甚至非常激烈。但喘振发生要有一定的条件,同一风机装于不同系统中,有的发生喘振,有的就不发生。失速发生时,尽管叶轮附近的工况有波动,但整台风机的流量、压力和功率是基本稳定的,可以连续运行。而喘振发生时,因流量、压力和功率的大幅度脉动,无法维持正常运行失速时,风机特性曲线可以测得。但喘振时,因工况脉动,无法进行正常的测量喘振仅仅发生于风机特性曲线中从顶峰以左的坡度区段,其压力降低是失速造成的。而失速现象存在于顶峰以左的整个区段。两者是密切相关的,可以说失速的存在是喘振发生的原因。

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