Plume flow and plume impingement in space technology

Dettleff, G.

doi:10.1016/0376-0421(91)90008-r

Cited by 74 publications

(30 citation statements)

References 57 publications

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“…A confidence level of 15 % is obtained for the shear stress values. The variation of the normalised shear stress [(τ/Po)(Zo/r*) 2 ] with stagnation pressure Po is given in Figure 6. Only very few attempts have been made on the determination of shear stress in low density flows.…”

Section: Results and Conclusionmentioning

confidence: 99%

“…Because of the very low external pressures encountered, these plumes expand to very large solid angles and may impinge upon the external surfaces of the satellite resulting in unknown effects including shear stresses [1]. The determination of shear stress due to impingement of low density flows is essential as described the review on plume impingement [2]. The expansion of the plume creates a flow field with different levels of rarefaction, i.e., continuum, transition and finally free molecular [3].…”

Section: Introductionmentioning

confidence: 99%

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Studies on Impingement Effects of Low Density Jets on Surfaces — Determination of Shear Stress and Normal Pressure

Sathian¹,

Kurian²

2005

AIP Conference Proceedings

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Abstract. This paper presents the results of the Laser Reflection Method (LRM) for the determination of shear stress due to impingement of low-density free jets on flat plate. For thin oil film moving under the action of aerodynamic boundary layer the shear stress at the air-oil interface is equal to the shear stress between the surface and air. A direct and dynamic measurement of the oil film slope is measured using a position sensing detector (PSD). The thinning rate of oil film is directly measured which is the major advantage of the LRM over LISF method. From the oil film slope history, direct calculation of the shear stress is done using a three-point formula. For the full range of experiment conditions Knudsen numbers varied till the continuum limit of the transition regime. The shear stress values for low-density flows in the transition regime are thus obtained using LRM and the measured values of shear show fair agreement with those obtained by other methods. Results of the normal pressure measurements on a flat plate in low-density jets by using thermistors as pressure sensors are also presented in the paper. The normal pressure profiles obtained show the characteristic features of Newtonian impact theory for hypersonic flows.

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Section: Results and Conclusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Studies on Impingement Effects of Low Density Jets on Surfaces — Determination of Shear Stress and Normal Pressure

Sathian¹,

Kurian²

2005

AIP Conference Proceedings

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“…For collisionless jet or impingement flows from a nozzle exit, most other researchers relied on numerical and experimental studies on the flow field and surface properties, for example [20][21][22]. By comparison, this paper presents new analytical investigation methods leading to exact expressions.…”

Section: Introductionmentioning

confidence: 99%

Gaskinetic Modeling on Dilute Gaseous Plume Impingement Flows

Cai¹

2016

Aerospace

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This paper briefly reviews recent work on gaseous plume impingement flows. As the major part of this paper, also included are new comprehensive studies on high-speed, collisionless, gaseous, circular jet impinging on a three-dimensional, inclined, diffuse or specular flat plate. Gaskinetic theories are adopted to study the problems, and several crucial geometry-location and velocity-direction relations are used. The final complete results include impingement surface properties such as pressure, shear stress, and heat flux. From these surface properties, averaged coefficients of pressure, friction, heat flux, moment over the entire flat plate, and the distance from the moment center to the flat plate center are obtained. The final results include accurate integrations involving the geometry and specific speed ratios, inclination angle, and the temperature ratio. Several numerical simulations with the direct simulation Monte Carlo method validate these analytical results, and the results are essentially identical. The gaskinetic method and processes are heuristic and can be used to investigate other external high Knudsen (Kn) number impingement flow problems, including the flow field and surface properties for a high Knudsen number jet from an exit and flat plate of arbitrary shapes. The results are expected to find many engineering applications, especially in aerospace and space engineering.

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“…Chen [17] used a gaskinetic method to accurately compute collisionless jet flow impingement loads on a solar panel. Dettleef [18] provided a detailed review of work on rarefied jets and jet impingement flows before 1990.…”

Section: Introductionmentioning

confidence: 99%

Rarefication Effects on Jet Impingement Loads

Cai

Zhang

et al. 2017

Aerospace

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Rarefication effects on jet impingement loads are studied by comparing recent new formulas at the collisionless flow limit and numerical simulations. The jet exit size is finite, and can be either planar or round. In the simulations, the jets have different degrees of rarefication, with a Knudsen (Kn) number ranging from 0 to infinity; i.e., the jet flows can be continuum, collisional, or collisionless. The comparison results indicate that (1) the new surface load formulas are accurate at the collisionless flow limit; (2) in general, the formulas offer upper limits for the peak loads; (3) however, it is improper to assert that local loads always decrease. The new formulas can offer fast estimations of impingement loads. This may be quite helpful for applications in space engineering by significantly reducing the amount of simulations and experiment costs. Those expressions explicitly include non-dimensional parameters, and their contribution and influence on the loads can be studied in a systematic manner (e.g., with a swift parameter study).

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Plume flow and plume impingement in space technology

Cited by 74 publications

References 57 publications

Studies on Impingement Effects of Low Density Jets on Surfaces — Determination of Shear Stress and Normal Pressure

Studies on Impingement Effects of Low Density Jets on Surfaces — Determination of Shear Stress and Normal Pressure

Gaskinetic Modeling on Dilute Gaseous Plume Impingement Flows

Rarefication Effects on Jet Impingement Loads

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