Heat shielding for Venus entry probes

Peterson, David L.; Nicolet, W. E.

doi:10.2514/6.1973-712

Cited by 5 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4,17) However, a lot of ablation analyses have been carried out using a constant value of the emissivity. For example, the values of 0.8 18) , 0.85 3,14,[19][20][21] and 0.9 22) are used, respectively. In this paper, the emissivity of the char surface was set to be 0.85.…”

Section: Input Data For Calculationmentioning

confidence: 99%

Thermal Response Simulation of Ultra Light Weight Phenolic Carbon Ablator by the Use of the Ablation Analysis Code

Kato

Okuyama

Gibo

et al. 2012

AEROSPACE TECHNOLOGY JAPAN

View full text Add to dashboard Cite

A space vehicle which undergoes the atmospheric re-entry or a planetary entry needs the heat shield system to protect inner equipments against severe aerodynamic heating environments. Charring ablator is usually used for the heat shield system. In order to design the heat shield system, it is necessary to predict the thermal behavior under aerodynamic heating by ablation analysis. A computer code for charring ablation and thermal response analysis is newly developed for simulation of one-dimensional transient thermal behavior of charring ablation materials. The mathematical model for the charring ablation including basic equation and computational method of ablation analysis is briefly described. A new ultra light weight phenolic carbon ablator called LATS (Lightweight Ablator series for Transfer vehicle) was recently developed. Arc-heated tests of the LATS ablator were carried out and measured results of the temperature response and surface mass loss are compared with the simulation results of the ablation analysis program. The agreement between the results of simulation and measurement is found to be good. It is also found that the mathematical model used in the ablation code can be applied to the ablation analysis of the low density LATS ablator.

show abstract

Section: Input Data For Calculationmentioning

confidence: 99%

Thermal Response Simulation of Ultra Light Weight Phenolic Carbon Ablator by the Use of the Ablation Analysis Code

Kato

Okuyama

Gibo

et al. 2012

AEROSPACE TECHNOLOGY JAPAN

View full text Add to dashboard Cite

show abstract

“…Because the function of the heat shield is very complex, a great deal of theoretical analysis and laboratory .testing went into its design [Peterson and Nicolet, 1974;Olstad et al, 1975]. Although the laboratory facilities used for the testing were quite sophisticated, they were not able to simulate completely the actual entry environment; moreover, the models tested were small in comparison with the actual probe.…”

Section: Introduction Function Of Heat Shieldsmentioning

confidence: 99%

Performance of entry heat shields on Pioneer Venus Probes

Pitts¹,

Wakefield²

1980

J. Geophys. Res.

View full text Add to dashboard Cite

The Pioneer Venus probes approached Venus with high relative velocity. As they entered the atmosphere, they were rapidly decelerated by aerodynamic drag, and a great deal of heat was generated. To protect the probe structure and the scientific instruments, a carbon phenolic heat shield was placed on the front of the probes. Because the design of heat shields for planetary entry is a developing technology, thermocouples were placed in the heat shields so that actual and predicted heat shield performance could be compared. The function of the heat shield is discussed, the probe environments during entry into the Venusian atmosphere are described, and some results from the heat shield experiment are presented. It was found that for the most part, the heat shields performed better than expected.

show abstract

“…By Sumio KATO, 1) Shoichi MATSUDA, 1) Keiichi OKUYAMA, 2) Kenta GIBO, 3) Hiroaki OYA, 4) Akihiro WATANABE, 1) Naoyuki SHIMADA 1) and Shunsuke SAKAI The effects of heat load, ablator density, and backup structure, etc. upon the heat shield performance of the lightweight phenolic carbon ablators named LATS were investigated using a one-dimensional ablation analysis code.…”

Section: Study Of the Effects Of Heat Load Ablator Density And Backumentioning

confidence: 99%

“…upon the heat shield performance of the lightweight phenolic carbon ablators named LATS were investigated using a one-dimensional ablation analysis code. The ablator density was assumed to be from about 260 to 1000kg/m 3 . Heat flux time histories of a rectangular pattern were assumed, where cases of constant heating duration time and constant accumulated heat load (up to 600MJ/m 2 ) were considered.…”

Section: Study Of the Effects Of Heat Load Ablator Density And Backumentioning

confidence: 99%

See 1 more Smart Citation

Study of the Effects of Heat Load, Ablator Density and Backup Structure upon the Thermal Protection Performance of Heat Shield Systems Consisting of Phenolic Carbon Ablators

Kato

Matsuda

Okuyama

et al. 2016

AEROSPACE TECHNOLOGY JAPAN

View full text Add to dashboard Cite

The effects of heat load, ablator density, and backup structure, etc. upon the heat shield performance of the lightweight phenolic carbon ablators named LATS were investigated using a one-dimensional ablation analysis code. The ablator density was assumed to be from about 260 to 1000kg/m 3 . Heat flux time histories of a rectangular pattern were assumed, where cases of constant heating duration time and constant accumulated heat load (up to 600MJ/m 2 ) were considered. The heating level was assumed to be from 1 to 10MW/m 2 , which means that the ablator surface is in the region of diffusion control oxidation/sublimation. The materials of the backup wall are assumed to be aluminum, stainless steel and high density CFRP. Main findings are: (1) For a low heat flux q with the same heating duration time tq, the necessary thickness, with which the maximum back surface temperature equals to the pre-determined allowable temperature, is nearly constant as the density v changes. On the other hand, the necessary thickness increases largely when q is larger and v is smaller. The ablator necessary mass increases with the increase of v and q for the same tq.

show abstract

Heat shielding for Venus entry probes

Cited by 5 publications

References 0 publications

Thermal Response Simulation of Ultra Light Weight Phenolic Carbon Ablator by the Use of the Ablation Analysis Code

Thermal Response Simulation of Ultra Light Weight Phenolic Carbon Ablator by the Use of the Ablation Analysis Code

Performance of entry heat shields on Pioneer Venus Probes

Study of the Effects of Heat Load, Ablator Density and Backup Structure upon the Thermal Protection Performance of Heat Shield Systems Consisting of Phenolic Carbon Ablators

Contact Info

Product

Resources

About