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Key issues of ultraviolet radiation of OH at high altitudes
Zhang YH(张羽淮); Wan T(万田); Jiang JZ(蒋建政); Fan J(樊菁)
Source PublicationAIP Conf. Proc. 1628
Conference Namethe 29th International Symposium on Rarefied Gas Dynamics
Conference DateJuly13-18, 2014
Conference PlaceXi'an, China
Ultraviolet (UV) emissions radiated by hydroxyl (OH) is one of the fundamental elements in the prediction of radiation signature of high-altitude and high-speed vehicle. In this work, the OHA2Σ+X2Π ultraviolet emission band behind the bow shock is computed under the experimental condition of the second bow-shock ultraviolet flight (BSUV-2). Four related key issues are discussed, namely, the source of hydrogen element in the high-altitude atmosphere, the formation mechanism of OH species, efficient computational algorithm of trace species in rarefied flows, and accurate calculation of OH emission spectra. Firstly, by analyzing the typical atmospheric model, the vertical distributions of the number densities of different species containing hydrogen element are given. According to the different dominating species containing hydrogen element, the atmosphere is divided into three zones, and theformation mechanism of OH species is analyzed in the different zones. The direct simulationMonte Carlo (DSMC) method and the Navier-Stokes equations are employed to compute thenumber densities of the different OH electronically and vibrationally excited states. Different to the previous work, the trace species separation (TSS) algorithm is applied twice in order to accurately calculate the densities of OH species and its excited states. Using a non-equilibriumradiation model, the OH ultraviolet emission spectra and intensity at different altitudes are computed, and good agreement is obtained with the flight measured data
Indexed ByCPCI
Document Type会议论文
Recommended Citation
GB/T 7714
Zhang YH,Wan T,Jiang JZ,et al. Key issues of ultraviolet radiation of OH at high altitudes[C]AIP Conf. Proc. 1628,2014.
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