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制動功率及其對渣漿泵特性曲線的影響
一、制動功率
制動功率是葉輪和壓水室之間液體交換的結(jié)果。在渣漿泵內(nèi)由于葉輪內(nèi)存在脫流區(qū)，在很大流量范圍內(nèi)，這種交換很重要，不僅在小流量狀態(tài)而且在最佳狀態(tài)或者接近最佳狀態(tài)產(chǎn)生制動功率。
在平衡試驗時，根據(jù)下列公式確定制動功率
二、制動功率發(fā)生過程
制動功率發(fā)生過程，可以用下列方式描述.
在單位時間內(nèi)，參與葉輪和壓水室之間交換的液體數(shù)量為qt.液體以能量等于qrHk從葉輪流入壓水室。在這部分液體與壓水室內(nèi)液體混合時，水頭損失等于Hk-Hors (式中，Horn 為壓水室內(nèi)的水頭)。這種水頭差是壓水室內(nèi)的損失hors.液體攜帶儲備能量等于qt(Hx - horm)返回葉輪。在葉輪內(nèi)有能量qHr傳給液體。式中HT為葉輪理論揚程。
根據(jù)$.A.鮑格尼茨卡婭和B. I.格爾瓦諾夫斯基進行的挖泥泵平衡試驗分析，可以做出下列結(jié)論:
(1）在葉輪和壓水室之間交換流量qt越大，液體從計算斷面進人壓水室的流量就越大，即計算斷面的流量Q,.越大。
(2）葉片上沒有脫流時; 在葉輪和壓水室之間不可能有交換。脫流區(qū)越大，即排擠系數(shù)越小(只考慮脫流)，交換流量qt就越大。這樣，液體在葉輪和壓水室之間交換強度與參數(shù)(1-%2)有關。
在qt和Q.-Q (1-%;)之間存在線性關系。渣漿泵
Braking Power and Its Effect on Slurry Pump Characteristic Curve
I. Braking power
Braking power is the result of liquid exchange between impeller and water chamber. In slurry pump, because the impeller has a detachment zone, in a large flow range, this exchange is very important, not only in a small flow state, but also in the optimal state or near the optimal state to generate braking power.
In the balance test, the braking power is determined according to the following formulas
2. Braking power generation process
The braking power generation process can be described in the following ways.
In unit time, the quantity of liquid exchanged between impeller and water chamber is qt. The liquid flows from impeller to water chamber with energy equal to qrHk. When this part of the liquid is mixed with the liquid in the pressurized water chamber, the head loss is equal to Hk-Hors (in formula, Horn is the head in the pressurized water chamber). This head difference is the loss of hors in the pressurized water chamber. The liquid carrying reserve energy is equal to QT (Hx - horm) returning to the impeller. In the impeller, energy qHr is transmitted to the liquid. HT is the theoretical head of impeller.
Based on the analysis of dredging pump balance tests conducted by $.A. Baughnitskaya and B. I. Gervanovsky, the following conclusions can be drawn:
(1) The larger the exchange flow QT between impeller and water chamber, the larger the flow of liquid from the calculated section into the water chamber, that is, the larger the flow Q of the calculated section.
(2) There is no exchange between the impeller and the water chamber when there is no bleeding on the blade. The larger the stripping zone, the smaller the extrusion coefficient (only considering the stripping), the larger the exchange flow qt. In this way, the exchange strength of liquid between impeller and water chamber is related to the parameter (1-%2).
There is a linear relationship between QT and Q. -Q (1-%). Slurry pump
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