Abstract
The three-dimensional flows within a full featured, unmodified annular gas turbine combustor have been investigated using a scanned stereoscopic PIV measurement technique. Volumetric measurements have been achieved by rigidly translating a stereoscopic PIV system to scan measurements around the combustor, permitting reconstruction of volumetric single-point statistics. Delivering the measurements in this way allows the measurement of larger volumes than are accessible using techniques relying upon high depth of field imaging. The shallow depth of field achieved in the stereoscopic configuration furthermore permits measurements in close proximity to highly detailed geometry. The measurements performed have then been used to assess the performance of the combustor port flows, which are central to the emissions performance and temperature/velocity profile at turbine inlet. Substantially differing performance was observed in the primary ports with circumferential position, which was found to influence the behaviour of the second secondary port jets. The measurements indicated that the interaction between the primary and secondary jets occurred due to variations in the external boundary conditions imposed by the annular passages in which the combustor is located.Graphic abstract
Highlights
This work demonstrates a novel approach for measuring volumetric velocity field data by rigidly translating a calibrated stereoscopic PIV system
The measurement system has been demonstrated by performing a survey of the velocity field within an annular gas turbine combustor, operating in an unfuelled condition
The tests were performed on the isothermal, low-speed, fully annular test facilities at Loughborough University, UK, which carefully manage the total pressure field surrounding the combustion system
Summary
This work demonstrates a novel approach for measuring volumetric velocity field data by rigidly translating a calibrated stereoscopic PIV system. The measurement system has been demonstrated by performing a survey of the velocity field within an annular gas turbine combustor, operating in an unfuelled condition. The PIV system was scanned slowly across multiple spatial locations with large numbers of samples acquired at each position This approach permits the calculation of time domain, volumetric statistics, but precludes the calculation of two-point statistics, e.g. turbulence length scales. The measurements described here, scan the PIV system at resolution of the order of the light sheet thickness This permits straightforward reconstruction of threedimensional, three component (3D3C) velocity statistics. The velocity field generated within a modern rich–quench–lean (RQL) combustor operating under unfuelled, non-reacting conditions has been surveyed. Semi-quantitative results are presented, describing the bulk mass transport processes associated with the isothermal the port flows
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