of Apollo Capsule Aerodynamics for Hypersonic Rare(cid:2)ed Conditions

of Apollo Capsule Aerodynamics for Hypersonic Rare(cid:2)ed Conditions
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高超音速罕见(cid:2)条件下的阿波罗太空舱空气动力学

DOI:
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发表时间:
2006
期刊:
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通讯作者:
F. A. Greene
F. A. Greene
中科院分区:
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文献类型:
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作者:
J. Moss;C. Glass;F. A. Greene

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结果显示了胶囊空气动力学的灵敏度稀疏(cid:2)在以下高度的速度变化(cid:17)(cid:7)(cid:9)公里(cid:2)对网格分辨率的灵敏度(cid:2)和物种的化学模型假设(cid:10)在(cid:21)(cid:9)km,NS模拟(cid:8)本文中呈现的DSMC结果以及来自一些最近研究的数据(cid:4)(cid:8)(cid:9)(cid:4)(cid:10)展示现有能力,(cid:12)诸如CEV的胶囊的低空气动力学(cid:2)一种在阿波罗指令舱设计发展时不存在的能力(cid:8)目前的结果表明,升力和升力(cid:11)到(cid:11)是一种在阿波罗指令舱设计发展时不存在的能力。11)拖拉机(cid:5)cents随着rarefac的降低而显著增加(cid:11)tion(cid:8)此外,(cid:2)纵向压力中心的位置对稀薄程度非常敏感,模拟表明,阿波罗太空舱的稳定配平点在(cid:17)(cid:7)(cid:9)km高度发生在入射角为(cid:11)(cid:17)(cid:15)(cid:4)degrees而不是nominal(cid:11)(cid:14)(cid:9)度(cid:12)由阿波罗拥有(cid:15)(cid:22)这是(cid:2)胶囊在很长时间内是静态不稳定的,如果不是所有的过渡性ow方案的结果,则不是Wilmoth等人讨论的胶囊的结果。对自由流速度变化的模拟结果表明,
Results are presented show the sensitivity of the capsule aerodynamics to rarefaction(cid:2) velocity variations at an altitude of (cid:17)(cid:7)(cid:9) km(cid:2) sensitivity to grid resolution(cid:2) and chemistry model assumptions of species(cid:10) at (cid:21)(cid:9) km with the NS simulations(cid:8) The DSMC results presented herein along with data from some recent studies (cid:4)(cid:8)(cid:9)(cid:4)(cid:10) demonstrate available capability to address the transitional (cid:12)ow aerodynamics of capsules such the CEV(cid:2) a capability that did not exist when the Apollo Command Module design was evolved(cid:8) The current results show that the lift and lift(cid:11)to(cid:11)drag coe(cid:5)cients increase substantially with decreasing rarefac(cid:11) tion(cid:8) Also(cid:2) the location of the longitudinal center of pressure is very sensitive to the degree of rarefaction and the simulations show that the stable trim point for the Apollo capsule at (cid:17)(cid:7)(cid:9) km altitude occurs at an incidence angle of (cid:11)(cid:17)(cid:15)(cid:4) degrees rather than the nominal (cid:11)(cid:14)(cid:9) degrees (cid:12)own by Apollo (cid:15)(cid:22) that is(cid:2) the capsule is statically unstable for much(cid:2) if not all(cid:2) of the transitional (cid:12)ow regime(cid:2) a result not that for capsules as discussed by Wilmoth et al(cid:8) (cid:4)(cid:11) for the Stardust sample return capsule and Moss et al(cid:8) (cid:4)(cid:5) for the Path(cid:16)nder capsule(cid:8) Results of the simulations for variations in free(cid:11)stream velocity show that the in