Abstract
The principal features of primary zone determine the performance parameters of the whole combustion chamber, such as the pollutant emissions and combustion efficiency. In this work, flow field and major species concentration measurements are conducted in the primary zone of an aero-engine combustion chamber. The operating conditions such as air inlet temperature, chamber pressure, and air-to-fuel ratio are chosen to replicate the realistic operating conditions. The velocity field and streamlines are obtained by particle imaging velocimetry technology. The concentrations of major species are acquired by a spontaneous Raman scattering system. This article validates the feasibility of two laser diagnostic measurement techniques and presents the initial results under realistic aero-engine conditions.
Highlights
Stable and efficient combustion over the entire range of the aero-engine working conditions is the primary task of the combustion chamber to achieve the maximum heat release for the limited space available
The opposing jets roughly penetrate to the half-height of the flame tube and impinge with each other, and two recirculation zones form behind the primary air jets
particle imaging velocimetry (PIV) technique is utilized to measure the velocity field in a realistic aero-engine combustion chamber associated with a swirl cup
Summary
Stable and efficient combustion over the entire range of the aero-engine working conditions is the primary task of the combustion chamber to achieve the maximum heat release for the limited space available. The flow characteristics in the primary zone contribute significantly to the forming of the recirculation zone, the distribution of the fuel/air mixture, combustion stability, and the length of the combustion zone.[1] The investigation of aerodynamics in the primary zone causes the continuous concern in combustion chamber design community and has become increasingly important due to the stringent emission regulations. The objective of this work is to measure the velocity field and major species distribution in order to provide additional insight into the aerodynamics of the primary zone. It is still a great challenge to obtain valuable information in realistic aero-engine combustion chambers because of the extremely complicated measuring environment
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