Abstract
Hydroxyl tagging velocimetry (HTV) is generally used for velocity measurement especially in the high-temperature and high-velocity flow field. In this work, according to the monotonous change of OH fluorescence intensity with temperature, the relative temperature distribution could be observed from the intensity distribution along the hydroxyl fluorescence line. We could obtain the temperature along the photodissociation line by calibrating at two positions. In this way, HTV has the potential for simultaneously achieving velocity and temperature without adding extra diagnostic systems.
Highlights
A variety of parameters such as temperature, velocity, composition, and concentration are necessary for a thorough analysis of the flow field;[1,2,3,4] among them, temperature and velocity are more important
There are two schemes for detection in the measurement region: the nonfluid flow field enables only the temperature measurement where the dissociation beam is perpendicular to the plane of the excitation sheet, acting in the region to form the OHp− spot, which is convenient for scitation.org/journal/adv point-to-point calibration; on the other hand, in the simultaneous T and V measurement, the excitation sheet and dissociation beam are parallel to the coaxial transmission, acting in the region to form the OHp− line, which can retrieve the velocity distribution
The higher the temperature, the higher the brightness of the spot, and the greater the fluorescence intensity. On this basis, according to the T–I relationship of OHp− fluorescence in Fig. 3(b), a new T–I relationship was obtained by the A and B temperature measurement and was compared with the thermocouple measurement results, as shown in Fig. 6(a), where the blue square belongs to the new T–I curve
Summary
A variety of parameters such as temperature, velocity, composition, and concentration are necessary for a thorough analysis of the flow field;[1,2,3,4] among them, temperature and velocity are more important. Most laser based techniques can obtain temperature or velocity only;[5,6] it is necessary to combine two laser diagnostic systems for measuring both of them. The complexity of the system is greatly increased.[7,8] In this way, particle imaging velocimetry (PIV) and planar laser-induced fluorescence (PLIF) integrated systems are mainly used in the combustion measurements above 1500 K.9. The integration of Rayleigh scattering and planar Doppler velocimetry (PDV) is limited by the anti-jamming ability, making it unsuitable to measure the real engine flow field.[10]. Hydroxyl tagging velocimetry (HTV) is different from PDV and PIV since it is not limited by anti-jamming ability, particle following ability, and particle injection issues. With the tagging characteristics of photodissociation hydroxyl (OHp−), it has successfully measured the velocity of a high-temperature high-speed flow field engine.[11–17]. In this paper, basing on temperature dependence of OHp− concentration, temperature along the whole photodissociation line is obtained, and the efficiency of the laser diagnosis system is improved
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