exactly how a vapor bubble can destroy impeller?

Question Posted / guest

3 Answers
8690 Views
IGCAR, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

exactly how a vapor bubble can destroy impeller?..

Answer / gurmeet singh

In certain point in fluid.. the presuure of localized point
or area decreases below vapour pressure.. this causes the
evaporation of fuild and vapour bubbles are formed. These
bubbles rise in the fluid and at certain point, where the
preesure is above vapour pressure, the bubbles blast. If it
occurs our surface (Turbine blade or any other), it causes
the preesue to effect the surface too. And the surface
comes under stress. After that stress is relived. this
process countinues. i.e. stressing and reliving. this cause
development of fatigue load, which inturen cause the
failure of the impeller.

Is This Answer Correct ?

12 Yes

0 No

exactly how a vapor bubble can destroy impeller?..

Answer / sriram_veluri

normally vapour bubbles are formed in an impeller due to
the phenomenon of turbine cavitation.the vapour bubbles
being low pressure points raise to the surface hitting the
impeller ,get ruptured between the high pressure fluid and
the impeller body and eventually burst damaging the
impeller body.

Is This Answer Correct ?

10 Yes

1 No

exactly how a vapor bubble can destroy impeller?..

Answer / parani

vapour bubble is one which cause damage the pump. pump is
not a pressure developing device ,due to rotation of
impeller speed a centrifugal force is created in case of
centrifugal pump where vaccum is created at centre which
air may mix with fluid to form bubbles ,where rotation of
impeller which strikes the bubbles which the oxidation
effect damage the pumpcasing & impeller.

Is This Answer Correct ?

3 Yes

7 No

Post New Answer

More Mechanical Engineering Interview Questions

Discuss the role of manganese in alloying steels?

0 Answers

How many volts required to fire spark plug.

19 Answers

why transformer required and why not voltage directly supply from power generation to the applications

3 Answers

Why is it that the maximum value which the residual stress can reach is the elastic limit of the material ?

0 Answers

what is the injection moulding

1 Answers

What are the properties of fuel oil?

0 Answers RRB,

What is the differance between Quality Assurance Plan & Inspection Test Plan

2 Answers Bureau Veritas,

1.an you please send all INTERVIEW Unigraphics/ansys QUESTIONS&ANSWERS. structural analysis,linear,nonlinear analysis,modal,harmonic analysis all questions @answers? Send all typical HR questions &answers?

3 Answers Kennametal, Sandvik,

Method of testing or checking boiler water?

2 Answers ABC Inc, RRB, Siemens,

• Could you describe a typical day or week in this position? What are the challenges facing this position?

1 Answers Petro Star Mount,

what is powercopy in catia v5

2 Answers

what is the purpose of reheating the fuel in gas turbine

5 Answers

For more Mechanical Engineering Interview Questions Click Here