| Status |
Accepted |
| journal_subject |
Part C |
| Article Type |
Regular Paper (More than 4 pages) |
| Article Filed |
|
| Article Title |
Mechanism of Characteristic Instability and its Suppression in Mixed Flow Pump |
| Keywords |
Mixed Flow Pump, Characteristic Instability, Pre-rotation, Groove, CFD. |
| Abstract |
It is revealed that positive slope of head-flow performance curves appears when the pump is working at
partial flow rates both for experimental and numerical investigations, and characteristics calculated agreed well
with experimental ones. CFD was used to study the mechanism of the performance curve instability of a test pump.
Because of the existence of high pressure differences at the partial flow rates, the fluid leakage occurred at the tip
clearance between the casing and the impeller. Furthermore, pre-rotation generated at the inlet of the impeller. The
theoretical head decreased because of the pre-rotation. When the flow rate decreased further, a strong vortex
occured at the inlet of the diffuser hub and blocked the discharge of the impeller. Therefore the flow pattern of the
impeller tends to a centrifugal type and the head of the mixed flow pump increased, subsequently the positive
slope of performance curve occured. Two ways were taken to suppress the performance curve instability, the
inadequate of the suppression method of the model and some positive results advices about the performance curve
instability suppression are proposed. A swirl-stop and diffuser optimization could somewhat improve the
instability but not ideal, while the proper shallow groove is a simple and useful method on suppression of pump
performance curve instability. |
| Authors |
| First Name
| Middle Name
| Last Name
| E-Mail
| Corresponding
|
| Zhongyong |
|
Pan |
pzy@ujs.edu.cn |
Yes |
| Taotao |
|
Wu |
|
No |
| Junjie |
|
Li |
|
No |
| Yanjun |
|
Li |
|
No |
|
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