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Saturday, August 1, 2020 | History

2 edition of Boundary-layer separation in supersonic propelling nozzles found in the catalog.

Boundary-layer separation in supersonic propelling nozzles

Herbert, M. V.

Boundary-layer separation in supersonic propelling nozzles

by Herbert, M. V.

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  • 19 Currently reading

Published by H.M.S.O. in London .
Written in English

    Subjects:
  • Boundary layer.,
  • Turbulence.,
  • Supersonic nozzles.

  • Edition Notes

    Bibliography: p. 36-39.

    Statementby M. V. Herbert and R. J. Herd.
    Series[Great Britain] Aeronautical Research Council. Reports and memoranda,, no. 3421, Reports and memoranda (Aeronautical Research Council (Great Britain)) ;, no. 3421.
    ContributionsHerd, R. J., joint author.
    Classifications
    LC ClassificationsTL526.G7 A4 no. 3421, TL574.B6 A4 no. 3421
    The Physical Object
    Pagination[1], 71 p.
    Number of Pages71
    ID Numbers
    Open LibraryOL5568364M
    LC Control Number67074982

    Morrisette LE, Goldberg TJ. Turbulent-flow separation criteria for over-expanded supersonic nozzles. Boundary-Layer Separation in supersonic propelling nozzles. Aeronautical research council reports and memoranda. Ministry of Aviation. Papamoschou D, Zill A. Fundamental investigation of supersonic nozzle flow separation. AIAA   Turbulent-flow separation criteria for overexpanded supersonic nozzles A comprehensive compilation of available turbulent flow separation data for overexpanded supersonic nozzles is presented with a discussion of correlation techniques, and prediction methods. Data are grouped by nozzle types: conical, contoured, and two dimensional wedge.

    Flows passing propelling nozzles, air inlets and wings at transonic and supersonic speeds are, among others, typical examples where shock/boundary-layer interac-tion may occur. SBLI often leads to extensive pressure fluctuations and turbulent boundary-layer separation. Arising in propelling nozzles or in air inlets, SBLI can. Exhaust or nozzle — Turbine exhaust gases pass through the propelling nozzle to produce a high velocity jet. The nozzle is usually convergent with a fixed flow area. Supersonic nozzle — For high nozzle pressure ratios (Nozzle Entry Pressure/Ambient Pressure) a convergent-divergent (de Laval) nozzle is used. The expansion to atmospheric.

    For flight at medium supersonic speeds, a propelling nozzle is required having a design pressure ratio in the rsr~je 15 to If an Boundary layer separation in supersonic flow can be produced quite easily - for example, by a rearward-facing stop or abrupt change of curvature - but that is not enough. Cold and hot flow tests were conducted to investigate theflow separation in rocket nozzles. The esults are presented. A separatior n data base includinga wide range of literature data is established to evaluate the influence of propellant combination and nozzle design on flow separation. As a result a simple separation criteria is suggested.


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Boundary-layer separation in supersonic propelling nozzles by Herbert, M. V. Download PDF EPUB FB2

Boundary-Layer Separation in Supersonic Propelling Nozzles By M. HERBERT and R. HERD COMMUNICATED BY THE DEPUTY CONTROLLER AIRCRAFT (RESEARCH AND DEVELOPMENT), MINISTRY OF AVIATION Reports and Memoranda No. " August, i Summary. A comparison has been made between the pressure rise at separation in convergent-divergent nozzles and.

The study is motivated by the occurrence of mixing enhancement outside CD nozzles operated at low pressure ratio. A novel apparatus allows investigation of many nozzle geometries with large optical access and measurement of wall and centerline pressures. The nozzle area ratio ranged from to and the pressure ratio ranged from to Cited by:   Differences between laminar or turbulent boundary layer FLOW SEPARATION IN ROCKET NOZZLE TCN 2 TCN 1 t ~ Laminar Separation - - Nozzle runninsfull i Nozzle area ratio.4/Ac Figure 5: Nozzle pressure distribution.

separation have been reproduced, dependency on 7 and nozzle shapes have been by: 2. Herbert, M. and Herd, R. J., "Boundary-Layer Separation in Supersonic Propelling Nozzles," R & MAeronautical Research Council, Two-Equation Eddy-Viscosity Turbulence Models for.

The past decade has seen a qualitative advancement of our understanding of physical phenomena involved in flow separation in supersonic nozzles; in particular, the problem of side loads due to asymmetrical pressure loads, which constitutes a major restraint in the design of nozzles Cited by:   Numerical investigation of flow separation behavior in an over-expanded annular conical aerospike nozzle Chinese Journal of Aeronautics, Vol.

28, No. 4 Numerical study of shock/boundary layer interaction in supersonic overexpanded nozzles. Separation of supersonic flow in a convergent–divergent nozzle is a basic fluid-dynamics phenomenon that occurs in a variety of aerospace applications.

When a supersonic nozzle is operating at pressure ratios well below its design point, a shock forms inside the nozzle and flow downstream of the shock separates from the nozzle walls.

Even. An experimental investigation was conducted to study the mechanisms that lead to the origin of flow asymmetry in overexpanded planar nozzles, especially at low nozzle pressure ratios. Three Mach 2 planar nozzles with different divergent wall angles but same area-ratio were tested.

For all three nozzles, a large portion of the dimensional pressure rise data across the separation shock shows the. Plug nozzles were used in earlier turbojets and for airplane applications before the Second World War.

1,2 1. Aukerman, “ Plug nozzles - the ultimate customer driven propulsion system,” in 27th Joint Propulsion Conference (American Institute of Aeronautics and Astronautics, ).

Sutton, History of Liquid Propellant Rocket Engines (American Institute of Aeronautics and. Scale analysis and experimental observations of shock-induced turbulent boundary layer separation in nozzles European Journal of Mechanics - B/Fluids, Vol.

26, No. 4 Flow Characteristics of Straight and Slanted Entry Nozzle Run by a Supersonic Stream. Where supersonic speeds are encountered, such as in the propelling nozzle of the rocket, athodyd, and some jet engines, a convergent-divergent nozzle or venturi (Figure 1–13) is used to obtain the maximum conversion of the energy in the combustion gases to kinetic energy.

Print book: National government publication: EnglishView all editions and formats: Rating: (not yet rated) 0 with reviews - Be the first. Subjects: Turbulent boundary layer. Stratified flow. Supersonic nozzles. More like this: Similar Items. Boundary Layer Separation in a Centrebod-y Nozzle with Parallel Shroud BY Previous work on boundary layer separation in supersonic nozzles has of propelling nozzle in an aircraft is governed by internal over-expansion the flon, thus depending upon separation characteristics, and hence upon the state of the boundary layer - Tlhether.

(2). With the nozzle contour properly designed,that is, shock free condition, the pressure on the boundary layer will be smooth and continuous from the nozzle throat to the nozzle exit.

(3). The inviscid supersonic flow field can be obtained from 2-D MOC exact numerical method. (4). Depending upon the upstream condition, the boundary layer can. Secondly, the shock wave/boundary layer interactions are studied numerically, with special attention given to the flow separation.

The concept of free interaction is confirmed. test section. This flow in the boundary layer must still be pumped, and it contributes significantly to the high volume flow. Thus, it appears that potentially there is a twofold benefit in reducing the thickness of the nozzle boundary layer: (1) a possible increase in diffuser effectiveness, and (2) a reduction in the amount of boundary layer flow.

Interaction between the normal shock wave and the turbulent boundary layer in a supersonic nozzle becomes complex with an increase of a Mach number just before the shock wave. When the shock wave is strong enough to separate the boundary layer, the shock wave is bifurcated, and the 2nd and 3rd shock waves are formed downstream of the shock wave.

Nozzles are actually used to modify the flow of a fluid (i.e. by increasing kinetic energy of the flow in expense of its pressure). Convergent-divergent type of nozzles are mostly used for supersonic flows because it is impossible to create supersonic flows (mach number more than one) in convergent type of nozzle and therefore it restricts us to a limited amount of mass flow through a.

Flow Separation is a red and white, marbled repainting of the John J. Harvey fireboat by artist Tauba project was a collaboration with the Public Art Fund and NOW, a British centenary arts program that has sponsored ship repaintings in the spirit of World War I dazzle camouflage. Lewis, J.

E Kubota, T Lees, L Experimental investigation of supersonic laminar two-dimensional boundary layer separation in a compression corner with and without cooling AIAA Paper 67 6 7 Spaid, F. W Frishett, J.

C Incipient separation of a supersonic, turbulent boundary layer, including effects of heat transfer AIAA J 10. The 26th International Symposium on Shock Waves in Göttingen, Germany was jointly organised by the German Aerospace Centre DLR and the French-German Research Institute of Saint Louis ISL.

The year marked the 50th anniversary of the Symposium, which first took place in in Boston and has since become an internationally acclaimed series of meetings for the wider Shock Wave Community.separation induced shock and then, as NPR increases, it interacts with the Mach disk.

If the internal shock was strong, its interaction with the Mach disk caused the annular jet of supersonic flow to deflect outward and reattach to the nozzle wall [9, 10]. Because of the boundary layer, the normal shock ends by lambda-shock structures [11].Many studies of turbulent supersonic boundary layer separation due to shock impingement, compression comers and steps have been conducted overx This work was supported by NASA Grant NGR under administration of the Aerodynamics Branch.