跳至主要内容

Pressure fluctuation propagation of a pump turbine at pump mode under low head condition

Pressure fluctuation at the vaneless space and vanes passages is one of the most important problems for the stable operation of
a pump turbine. The fluctuation appears in any operating condition. Much research has been done on the pressure fluctuation
of hydraulic machinery. However, the details of pressure fluctuation propagation of the pump turbine at the pump mode have
not been revealed. The modern pump turbine with high water head requires the runner to be “flat”, which would induce pressure
fluctuation more easily than the low head pump turbine. In this article, a high head pump turbine model is used as the research
object. As the pressure fluctuation at off-design point is more serious than at the design point, the low head condition is
chosen as the research condition. Pressure fluctuation at the vaneless space and vanes passages is predicted by the computational
fluid dynamics method based on k- shear stress transport model. The experiment conducted on the test rig of the Harbin
Institute of Large Electrical Machinery is used to verify the simulation method. It proves that the numerical method is a
feasible way to research the fluctuation under this operating condition. The pressure fluctuation along the passage direction is
analyzed at time and frequency domains. It is affected mainly by the interaction between the runner and vanes. In the circumferential
direction, the influence of the special stay vane on the pressure fluctuation is got. The amplitude in the high-pressure
side passage of that vane is lower than that in the other side. The study provides a basic understanding of the pressure fluctuation
of a pump turbine and could be used as a reference to improve the operation stability of it.
Jiangxi Gelaili pump industry co.,ltd produce centrifugal water pump,we have CDL,CDLF series,CHL,CHLF series stainless steel pump,can be used as ro booster pump, shower pump,fire pump,coolant pump,aquarium water pump and so on,we also supply cast iron pump,they are WQ series dewatering pumps,dirty water pump and GD series pipeline pump.
Gelaili pump industry co.,ltd supplies you competitive price and high quality products.


标签：

评论

发表评论

此博客中的热门博文

Causes of Electric Motor Burning by Water pump

1. First, find out whether the motor burns the bearing (mechanical fault) or the coil (electrical fault). If it is the fault of burning coil, it is mainly caused by overcurrent, sometimes too high or too low voltage will also cause the coil to heat and short circuit, so check that the voltage when running is too different from the rated voltage.There may be several reasons for over-current short-circuiting: A. the equipment is overloaded to make the motor run for a long time at rated or over rated current. In particular, the starting current of the motor is 3-5 times that of the rated current. Therefore, we should try to avoid running with load or full load when starting the equipment (mainly depending on the matching allowance of rated current and normal operating current of motor). B, the motor works in a wet working environment. The insulation of the coils should be checked before the motor starts. The insulation requirements of different voltage grades are also different. May r...
发表评论
阅读全文

Several type of pumps for changing human life

Today we will talk about several type of water pump ,which changes our life. 1, Booster pump :The last decades,people who lives in high building can feel pains caused by the low water pressure,especially in rush hour.But now,the convenience booster pump takes to us become a part of our life. We nearly forget it exist.In nowadays,building is taller and taller,but even on the top of the high cloud bulding,the flow of water is also very stable and strong. 2,Ro booster pump:As ro technology developed,ro booster pump step into our daily life,since the pump appeared ,make water clean and safety is not a hard work,this type of pump helps a lot of people drink clean water,avoid disease,especially some people who is required only drink purified water,do not need to pay too much money to buy purified water,we can get it anywhere.Even in desert,bottle water can be brought easily.some sweet water purified by sea water,how magical pump is it? 3, Aquarium water pump ,fishes which we can see on...
发表评论
阅读全文

How much is the stainless steel water pump?

We are very concerned about the price of the stainless steel centrifugal pump? How much money of stainless steel pump, in fact, this has a great relationship with product quality,some stainless steel pump like Grundfos,the price is higher, the quality is good. But there are also some stainless steel water pump,like Gelaili pump,the quality is good, but the price is not so high,it’s like buying a steak with the cabbage money. There are some small factories, the quality of their water pump production is not stable, the user experience is very poor, the price is very cheap, but in the process of using, maintenance costs have far exceeded the saved money when the pump was brought down. Therefore, how much is the stainless steel pump, really depends on the quality of the product, there is no enterprise willing to do business at a loss. How much is the stainless steel pump, stainless steel pump manufacturers and production experience affected price.Grundfos pump manufacturing history, c...
发表评论
阅读全文