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Originally Posted by aronhk_md
Not sure what your issue is, but I'm also not sure how your posts are now facts and mine conjecture.
In bold above you are declaring a decrease in clearance between suction and the vanes as if you are referring to the distance between 2 objects. Vanes are an object, suction is a description of a physical force better described by other terms. You cant have a distance between these two.
In the red portion I highlighted you claim that you reduce parasitic recirculating losses. Parasitic losses are NOT recirculating losses. Parasitic losses are for example...friction. Nevertheless.....it still equals what I said...less EFFICIENCY for the pump.
I understand physics fairly well.
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What, did you stay out at a Holiday Inn Express, last night, or what? You can either do a little research or you can try to justify your false premises. My issue is that you've given wrong information and are trying to insist it's gospel.
There are two basic sides to a pump, the suction and the discharge, A pump's suction is the area of the pump where a low pressure is formed to allow atmospheric pressure to push the fluid into the pump.
The whole pump is a parasitic loss for the engine, anything which decreases the amount of fluid pumped by it is a further
parasitic loss. To be absolutely, perfectly clear, the loss from recirculating discharge back to the suction is called a pumping loss.
Please, if you can offer anything to substantiate your claims, do so. In the meantime, here's a little snippet for you to digest. You can add it to your understanding of physics.
Quote:
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Efficiency loss due to off-BEP operation is primarily the result of recirculation and fluid blockage caused by a mismatch between the pump's design flow and the actual flow. As the flow rate moves away from BEP, there is an increasing differential between the inlet vane angle and the approaching flow angle. Similar losses occur between the impeller vane exit and the volute or diffuser. The result is increased recirculation within the impeller passages and between the impeller and casing.
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Here's the link, if you're interested:
http://www.lawrencepumps.com/newslet...01_i4_Sep.html
In my profession, I've removed many, many pumps, used for cooling or supply, which were not performing up to snuff. Most of them would have an inserted "wearing ring" on the impeller and a "casing ring" in the casing. The quick fix would be to replace the rings if you had to get the pump back in service, quickly. The proper fix would be to ceramic coat the inside of the casing, replace the impeller and the wearing ring and the pump would be as good as, or better than, new.