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Numerical investigation of vibration...

North Dakota State University.

Numerical investigation of vibration in a steam turbine control valve.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Numerical investigation of vibration in a steam turbine control valve./
作者:	Novak, Luke Michael.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	194 p.
附註:	Source: Masters Abstracts International, Volume: 56-02.
Contained By:	Masters Abstracts International56-02(E).
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10252647
ISBN:	9781369504507

Numerical investigation of vibration in a steam turbine control valve.
Novak, Luke Michael.

Numerical investigation of vibration in a steam turbine control valve. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 194 p.

Source: Masters Abstracts International, Volume: 56-02.

Thesis (M.S.)--North Dakota State University, 2017.

A numerical analysis is performed at North Dakota State University to investigate and resolve steam inlet control valve vibration in a Minnkota Power Cooperative turbine. Pressure fluctuations resulting from an unstable flow pattern are found to cause vibration. Multiple valve disc and seat design modifications to stabilize the flow are made and tested. The full scale geometry is used with steam as the working material. Both steady-state and transient analyses are completed. Analytical calculations are used for verification. Investigation of all modifications is discussed. Results from the original valve configuration show vortex shedding off of the disc. A currently installed cutoff disc has not removed flow-induced vibration. Flow expansion generates unstable flow, creating an unsteady separation bubble on the valve seat at the throat exit. Changing the throat from a converging-diverging to a purely converging nozzle stabilizes the flow, removing the flow-induced pressure forces causing disc vibration.

ISBN: 9781369504507Subjects--Topical Terms:

557493
Mechanical engineering.

Numerical investigation of vibration in a steam turbine control valve.
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245 1 0 $a Numerical investigation of vibration in a steam turbine control valve.
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300 $a 194 p.
500 $a Source: Masters Abstracts International, Volume: 56-02.
500 $a Adviser: Bora Suzen.
502 $a Thesis (M.S.)--North Dakota State University, 2017.
520 $a A numerical analysis is performed at North Dakota State University to investigate and resolve steam inlet control valve vibration in a Minnkota Power Cooperative turbine. Pressure fluctuations resulting from an unstable flow pattern are found to cause vibration. Multiple valve disc and seat design modifications to stabilize the flow are made and tested. The full scale geometry is used with steam as the working material. Both steady-state and transient analyses are completed. Analytical calculations are used for verification. Investigation of all modifications is discussed. Results from the original valve configuration show vortex shedding off of the disc. A currently installed cutoff disc has not removed flow-induced vibration. Flow expansion generates unstable flow, creating an unsteady separation bubble on the valve seat at the throat exit. Changing the throat from a converging-diverging to a purely converging nozzle stabilizes the flow, removing the flow-induced pressure forces causing disc vibration.
590 $a School code: 0157.
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