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Turbomachinery Aerodynamics

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Question: Looking 4 some e-book/videos to understand concept of active and passive flow control.It would be good if it gives an overview of these devices,how they function and are applied to turbo machinery,expected benefit and the most important parameters of these flow control devices. Regards, Manoj

By: Manoj Date: 2012-10-06

Answer: You may refer to the following book: Flow Control by Gad El Hak. The book gives all that you are looking for. Regards, Pradeep.

By: Prof. A M Pradeep Date: 2012-10-12

Question: Hello Prof, Thanks for the video lectures, If its possible can you please give the pdf or ppt format of the lectures? I feel it will be nice to follow the lectures and to make notes. Thanks, Sivakumar

By: Sivakumar Date: 2012-11-19

Answer: The lecture notes will be uploaded on the NPTEL website shortly. Please look out for the same.

By: Prof. A M Pradeep Date: 2012-11-27

Question: Respected Sir, In your Lect-23(Problem#4),it is said that if axial velocity is constant then for impulse turbines,v2=v3=c3.My doubt is, since beta2=beta3 we get v2=v3 but how it is equal to c3?I get alpha3=21.75deg so c3 comes around 161.5m/s while v2=v3=341.15m/s.Kindly correct me if i'm wrong.

By: Krishn Date: 2012-12-06

Answer: Please check the velocity triangle. When the axial velocity is constant, for an impulse turbine rotor, V2=V3=C3. Here you should be getting alpha3=beta3 and beta2. Please re-check.

By: Prof. A M Pradeep Date: 2012-12-07

All Questions for this Course

By: Manoj Date: 2012-10-06

Answer: You may refer to the following book: Flow Control by Gad El Hak. The book gives all that you are looking for. Regards, Pradeep.

By: Prof. A M Pradeep Date: 2012-10-12

Question: Good day Professors, On exercise problem # 3 I got for c) -51,2 KJ/Kg,the flow is doing the work on the compressor, this seems to logical since beta2(25°) is smaller than beta1 (54,82°).I can not calculate the density using data given. Your comments will be appreciate. Thanks Valeriy Dazun

By: valeriy dazun Date: 2012-10-19

Answer: Density can be calculated by assuming the inlet pressure and temperature to be that of standard sea level conditions. Work done will be +51.2 as it is a function of tan(beta1)-tan(beta2).

By: Prof. A M Pradeep Date: 2012-10-30

Question: In Problem #1 solution shows P2=1.216 bar,but from the pressure ratio Po2=1.2 bar.Using isentropic relation (T2=284.91K, To2=303.41K, Po2=1.2bar)we arrive to P2 as 0,963 bar. Please comment. Thanks

By: Zamir Date: 2012-11-17

Answer: This is a typo error. P2 should be 0.963 bar as you have correctly pointed out. Thanks. The slides will be corrected shortly.

By: Prof. A M Pradeep Date: 2012-12-07

By: Sivakumar Date: 2012-11-19

Answer: The lecture notes will be uploaded on the NPTEL website shortly. Please look out for the same.

By: Prof. A M Pradeep Date: 2012-11-27

By: Krishn Date: 2012-12-06

Answer: Please check the velocity triangle. When the axial velocity is constant, for an impulse turbine rotor, V2=V3=C3. Here you should be getting alpha3=beta3 and beta2. Please re-check.

By: Prof. A M Pradeep Date: 2012-12-07

Question: In Problem #1 solution P2 as 0,963 bar. Please comment. Thanks

By: Mukesh kumar Date: 2013-02-21

The co-ordinator will post his answer

Question: In Problem #1 solution,for finding Degree of reaction formula 1-Ca(tanB1+tanB2)/2U was used but in Lecture-3 formula derived for the same was Ca(tanB1+tanB2)/2U. Please comment. Thanks

By: Mukesh kumar Date: 2013-02-22

The co-ordinator will post his answer