NDLI: Wave structure and flow amplitude-frequency characteristics in the turbine nozzle lattice in the presence of phase transition

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Wave structure and flow amplitude-frequency characteristics in the turbine nozzle lattice in the presence of phase transition

Content Provider	Springer Nature Link
Author	Gribin, V. G. Gavrilov, I. Yu. Tishchenko, A. A. Tishchenko, V. A. Alekseev, R. A.
Copyright Year	2017
Abstract	This paper is devoted to the wave structure of a flow at its near- and supersonic velocities in a flat turbine cascade of profiles in the zone of phase transitions. The main task was investigation of the mechanics of interaction of the condensation jump with the adiabatic jumps of packing in a change of the initial condition of the flow. The obtained results are necessary for verification of the calculation models of the moisture-steam flow in the elements of lotic parts of the steam turbines. The experimental tests were made on a stand of the wet steam contour (WSC-2) in the Moscow Power Engineering Institute (MPEI, National Research University) at various initial states of steam in a wide range of Mach numbers. In the investigation of the wave structure, use was made of an instrument based on the Schlieren-method principle. The amplitude-frequency characteristics of the flow was found by measurement of static pressure pulsations by means of the piezo resistive sensors established on a bandage plate along the bevel cut of the cascade. It is shown that appearance of phase transitions in the bevel cut of the nozzle turbine cascade leads to a change in the wave structure of the flow. In case of condensation jump, the system of adiabatic jumps in the bevel cut of the cascade becomes nonstationary, and the amplitude-frequency characteristics of static pressure pulsations are restructured. In this, a change in the frequency pulsations of pressure and amplitude takes place. It is noted that, at near-sonic speeds of the flow and the state of saturation at the input, the low-frequency pulsations of static pressure appear that lead to periodic disappearance of the condensation jump and of the adiabatic jump. As a result, in this mode, the flow discharge variations take place.
Starting Page	379
Ending Page	386
Page Count	8
File Format	PDF
ISSN	00406015
Journal	Thermal Engineering
Volume Number	64
Issue Number	5
e-ISSN	15556301
Language	English
Publisher	Pleiades Publishing
Publisher Date	2017-04-28
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	steam turbine supersonic flows phase transitions pressure pulsations Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Nuclear Energy and Engineering

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