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Experimental Investigation of a Linear Cascade with Large Solidity Using pressure sensitive paint and Dual-Camera System

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Journal of Thermal Science 2021年第2期30卷 682-695页

作者： GAO Limin YANG Guanhua GAO Tianyu LI Ruiyu HU Xiaoquan School of Power and Energy Northwestern Polytechnical UniversityXi'an 710129China The National Key Laboratory of Aerodynamic Design and Research Xi'an 710129China

pressure sensitive paint(PSP)technique has been increasingly applied to the experimental research of aerodynamics and thermodynamics due to its strengths of non-contact,high resolution results and large coverage area,***,rarely has this technique been successfully used to the study of internal flow such as compressor cascade,since narrow flow passages would heavily restrict the acquisition of PSP *** this paper,PSP technique was used to study the pressure distribution on a linear compressor cascade with large solidity of 2.3,where the view of recording camera can be heavily blocked due to adjacent blade *** help get integrated PSP images of the internal flow passage,dual camera system along with image processing tools like 3D reconstruction and image integration were *** results showed that with the aid of such assistance,image results with good quality and readability could be ***,pressure data given by PSP were compared with data from traditional way of pressure taps and showed good *** results of the entire cascade passage surface were given with different inlet Mach numbers and incidence *** results showed that PSP technique can integrally measure cascade tunnel of large solidity with the help of dual-camera system.

关键词： pressure sensitive paint compressor cascade dual-camera system large solidity full channel measurement

Turbine Endwall Film Cooling With Combustor-Turbine Interface Gap Leak- age Flow: Effect of Incidence Angle

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Journal of Thermal Science 2013年第2期22卷 135-144页

作者： ZHANG Yang YUAN Xin Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University

This paper is focused on the film cooling performance of combustor-turbine leakage flow at off-design condition. The influence of incidence angle on film cooling effectiveness on first-stage vane endwall with combustor-turbine interface slot is studied. A baseline slot configuration is tested in a low speed four-blade cascade comprising a large-scale model of the GE-E 3 Nozzle Guide Vane (NGV). The slot has a forward expansion angle of 30 deg. to the endwall surface. The Reynolds number based on the axial chord and inlet velocity of the free-stream flow is 3.5 × 10 5 and the testing is done in a four-blade cascade with low Mach number condition (0.1 at the inlet). The blowing ratio of the coolant through the interface gap varies from M = 0.1 to M = 0.3, while the blowing ratio varies from M = 0.7 to M = 1.3 for the endwall film cooling holes. The film-cooling effectiveness distributions are obtained using the pressure sensitive paint (PSP) technique. The results show that with an increasing blowing ratio the film-cooling effectiveness increases on the endwall. As the incidence angle varies from i = +10 deg. to i = 10 deg., at low blowing ratio, the averaged film-cooling effectiveness changes slightly near the leading edge suction side area. The case of i = +10 deg. has better film-cooling performance at the downstream part of this region where the axial chord is between 0.15 and 0.25. However, the disadvantage of positive incidence appears when the blowing ratio increases, especially at the upstream part of near suction side region where the axial chord is between 0 and 0.15. On the main passage endwall surface, as the incidence angle changes from i = +10 deg. to i = 10 deg., the averaged film-cooling effectiveness changes slightly and the negative incidence appears to be more effective for the downstream part film cooling of the endwall surface where the axial chord is between 0.6 and 0.8.

关键词： Film Cooling Endwall pressure sensitive paint Leakage Flow

Reconstruction of skin friction topology in complex separated flows

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Advances in Aerodynamics 2023年第1期5卷 579-613页

作者： Tianshu Liu Department of Mechanical and Aerospace Engineering Western Michigan UniversityKalamazooMI 49008USA

This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows,which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux(BEF).The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational *** applications,the approximate method is proposed,where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order *** approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures(skin friction source/sink,vortex and their combinations)by a linear superposition of some simple surface pressure *** distinct topological features,such as critical points,separation lines and attachment lines,naturally occur as a result of such *** examples,some elemental skin friction structures in separated flows are reconstructed in simulations,and the skin friction fields in shock-wave/boundary-layer interactions(SWBLIs)are reconstructed from pressure sensitive paint(PSP)images obtained in wind tunnel experiments.

关键词： Skin friction Surface pressure Boundary enstrophy flux Flow separation Topology Inverse problem Variational method Euler-Lagrange equation Taylor-series-expansion solution Navier-Stokes equations Poincare-Bendixson index formula Shock-wave/boundary-layer interaction pressure sensitive paint Aerodynamics

Recent Developments of Image Based Measurement Methods for Application to Transonic Flows in Industrial Wind Tunnels

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Chinese Journal of Aeronautics 2006年第2期19卷 114-125页

作者： J.KOMPENHANS J.AGOCS Y.EGAMI R.ENGLER U.FEY H.FRAHNERT K.de GROOT U.HENNE T.KIRMSE C.KLEIN F.KLINGE R.KONRATH L.KOOP H.MATTNER D.OTTER D.PALLEK W.SACHS A.SCHRDER B.STASICKI German Aerospace Center (DLR) Institute of Aerodynamics and Flow Technology 37073 GttingenBunsenstrasse 10 Germany

The experimental investigation of unsteady complex flow fields in wind tunnels requires advanced measurement techniques. The most important of such image based measurement techniques are those for the measurement of planar flow velocity fields, planar pressure distribution, model location and deformation, model temperature and quantitative high speed flow visualization. The applications as carried out by DLR range from low speed flows to transonic flows, from high lift configurations to propellers and rotors, from wake vortex investigations in catapult facilities and water towing tanks to investigations of vortex break down phenomena on delta wings. The capability to use image based measurement techniques in transonic flows requires dedicated technical developments and experienced scientists due to the special environment of a transonic wind tunnel. In this paper an overview of the state-of-the art of the application of image based measurement techniques in transonic flows as performed by DLR＇s Institute of Aerodynamics and Flow Technology will be given.

关键词： industrial wind tunnel transonic flow image based measurement techniques pressure sensitive paint particle image velocimetry model deformation measurement techniques thermography non-standard video techniques

Application of Fluorescence pressure Transducer Technology to pressure Measurement Test in High Speed Wind Tunnel

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Application of Fluorescence Pressure Transducer Technology t...

Application of median filter technique and ESP in PSP data processing

第24届中国控制与决策会议

作者： CHEN XueYuan 1 1. AVIC Aerodynamics Research Institute, Shenyang, 110034, China

pressure measurement has always been an important part of aircraft wind tunnel tests. The traditional method of pressure measurement uses the model with a series of special pressure taps on its surface to get discontinuous pressure data. Recently, pressure sensitive paint （PSP） technology which uses optical method for measuring pressure distribution of the surface of the specific area has attracted much attention as an effective approach for pressure measurement. This paper introduces the basic theory of the pressure sensitive paint （PSP） measurement technology and the development of control system for the experiments. The analysis of the experiments data provides the credible evidence for the farther popularization of the pressure sensitive paint （PSP） measurement technology.

关键词： Optical pressure Measurement pressure sensitive paint Experiments Control Digital CCD Camera

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Application of median filter technique and ESP in PSP data p...