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Tuesday, July 14, 2020 | History

3 edition of Effects of inlet conditions on crossflow jet mixing found in the catalog.

Effects of inlet conditions on crossflow jet mixing

Effects of inlet conditions on crossflow jet mixing

  • 135 Want to read
  • 15 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Inlet flow.,
  • Cross flow.,
  • Mie scattering.,
  • Jet mixing flow.,
  • Flow distribution.,
  • Turbulence effects.

  • Edition Notes

    StatementD.S. Liscinsky and B. True, J.D. Holderman.
    SeriesNASA technical memorandum -- 107258
    ContributionsTrue, B., Holderman, J. D., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17121316M

    Several factors such as the jet inlet velocity profile, nozzle geometry, jet Reynolds number and fluid temperature at the inlet, affect the jet spread. Here, a brief account of the factors and phenomena which influence jet growth is presented. Inlet Velocity Profile The initial condition of the jet influences the downstream development of. ing the effects of momentum flux ratio on the spatio-temporal evolution of gaseous and spray fields, and associated statistics of liquid jet in vitiated air crossflow is presented using a large eddy simulation (LES) based framework. Rest of the paper is organized in 5 sections. Section 2 de-tails the theoritical framework and numerical methods.

    Experiments are conducted for tee diffusers with different designs discharging in a crossflow. Measurements of dilution are reported and analyzed along with the results obtained by previous studies to investigate the effects of different outfall and ambient parameters on dilution.   The jet core decreases and the gravity center in the mixing field falls, accompanied by an elongated and narrowed jet plume in any transverse planes downstream. In the case of a sonic ethylene jet into supersonic air crossflow, the salient shock structures are presented in the time-averaged field and further elaborated using instantaneous data.

    Facilities Viscous Jet Mixing Facility. The Viscous Jet Mixing facility is designed to investigate the turbulent mixing of high Schmidt number, reacting fluids in two streams. The facility is capable of a jet in co-flow configuration to investigate the effects of inlet conditions on the jet instability, and the subsequent shear driving mixing. Liscinsky, D.S., True, B., Effects of Inlet Flow Conditions on Cross-Flow Jet Mixing, 32nd Joint Propulsion Conference cosponsored by AIAA, ASME, SAE, and ASEE, Florida, Jean-Michel, Device for Mixing a Liquid Fertilizer with a Flow of Water for Use by Individuals, US PATENT US 6,, B2,


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Effects of inlet conditions on crossflow jet mixing Download PDF EPUB FB2

Effects of inlet flow conditions on crossflow jet mixing. This paper describes the effect of jet injection angle, cross-flow Reynolds number and velocity ratio on entrainment and mixing of jet.

Additional Physical Format: Online version: Liscinsky, D.S. (David S.). Effects of inlet flow conditions on crossflow jet mixing. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, June National Aeronautics and Space Administration. Effects of inlet conditions on crossflow jet mixing [microform] / D.S.

Liscinsky and B. True, J.D. Holderman National Aeronautics and Space Administration ; National Technical Information Service, distributor [Washington, DC]: [Springfield, Va. Wikipedia Citation. An experimental investigation of the effects of jet inlet flow conditions has been conducted for the isothermal mixing of a single jet injected into a crossflow.

Jet penetration and mixing was. jet inlet (X/H jet inlet is that the weak jet can easily be blown off and diffused by the cross-flow. Mixing phenomena are discussed in detail in the following section. Table. Calculated cases Momentum flux ratio Jet velocity Cross-flow velocity penetration (Eq.(1) (6)) J V.

m/s. Experiments in dilution jet mixing - Effects of multiple rows and non-circular orifices. HOLDEMAN, R. SRINIVASAN, E. COLEMAN, G. MEYERS and C. WHITE; 21st Joint Propulsion Conference August Effects of inlet flow conditions on crossflow jet mixing.

Air at ambient conditions, 1 atm and K, is selected as the working fluid for both the jet and the crossflow. The jet-to-crossflow density ratio is unity in this study; otherwise, the jet-to-crossflow momentum flux ratio, J = (ρ j U j 2) / (ρ c U c 2) ⁠, should be considered to account for the momentum effects on the jet evolution.

The. The cross-flow velocity profile is initialized using a similarity solution of laminar boundary layer at Reynolds number of A standard circular pipe flow Poiseuille-type velocity profile, that is, 𝑣 (𝑟) = 𝑣 m a x (1 − 𝑟 2 / 𝑅 2), is used at the inlet of a circular jet orifice and for 2D non-circular duct and elliptic pipe geometries, an interpolation procedure is applied.

Jet-to-crossflow blowing ratios ofand are used with a density ratio of 1. It is shown that the flow field at the jet exit is strongly influenced by the crossflow as well as by the inlet conditions at the entrance to the jet orifice. Stable fuel distribution and mixing is noteworthy for increasing the efficiency of the scramjet engine at high-speed flight.

In this work, numerical s. Holdeman JD, Vardakas MA, Chang CT () Mixing of multiple jets with a confined subsonic crossflow: part III—the effects of air preheat and number of orifices on flow and emissions in an RQL mixing section.

NASA/TM—, March (similar to J Fluids Eng (11)–, Nov ; derived from NASA TM, September ). This paper presents experimental results on spray characteristics of the water-diesel fuel mixture in air crossflow.

Penetration of jet, droplet size. The mixing of the round jet normal to a uniform crossflow is studied for a range of jet-to-crossflow velocity ratios, r, from 5 to Planar laser-induced fluorescence (PLIF) of acetone vapour seeded into the jet is used to acquire quantitative two-dimensional images of the scalar concentration field.

Effects of Inlet Flow Conditions on Crossflow Jet Mixing. An experimental investigation of the effects of mainstream turbulence, mainstream swirl and non-symmetric mass addition has been conducted for the isothermal mixing of multiple jets injected into a confined rectangular crossflow.

Jet penetration and mixing in the near field was. The results of extensive experiments on jet-induced mixing in water storage tanks are reported in two papers.

The experiments were conducted on three styles of storage tanks using a newly developed three-dimensional laser-induced fluorescence (3DLIF) system that can measure the whole field of tracer concentrations in the tanks and its temporal evolution through the mixing process.

Effects of inlet flow conditions on crossflow jet mixing. 32nd Joint Propulsion Conference and Exhibit. Citation | PDF ( KB) | PDF Plus ( KB) D. Liscinsky, B. True, J. Holdeman. Jet in crossflow mixing 1. Effect of Jet Configuration on Transverse Jet Mixing Process Sin Hyen Kim, Yonduck Sung, Venkat Raman Department of Aerospace Engineering and Engineering Mechanics The University of Texas at Austin 2.

McClinton, C. Effect of ratio of wall boundary layer thickness to jet diameter on mixing of a normal hydrogen jet in a supersonic stream. NASA TM X McDaniel, J. & Graves, J. Laser-induced-fluorescence visualization of transverse gaseous injection in.

JETS IN CROSS-FLOW Figure Maximum, mini-mum and time-averaged mean concentration in a planar jet. (Adapted from Kotsovinos, ) c(x,r) = cmax exp − r2 2σ2 = cmax exp − 50r2 x2. () where cmax(x) is the peak concentration along the centerline, a function of the distance x. Conservation of the total amount of contaminant.

Transverse jet in supersonic crossflow: A jet in crossflow (JICF) is a fundamental canonical flow for the investigation of turbulent mixing and combustion. It is of relative simplicity yet retaining many features of interest, such as three-dimensionality, separation and recirculation regions, wall-bounded effects.

A leading parameter determining the jet lift-off is the velocity ratio R (Eq. 1) or, if the densities in the jet and the crossflow are different, the effective velocity ratio R e, which is defined as the square root of the momentum flux ratio (Eq.

2). R = V jet V crossflow (1) R e = (ρV2) jet (ρV2) crossflow (2).While the jet mixing studies illustrate much activity with respect to a nonreacting system, research into reacting jet-in-crossflow systems has been limited.

Tests on multiple jet mixing in reacting flows have been performed on model gas turbine combustors of a can-type, or cylindri-cal duct geometry.An experimental investigation of the effects of jet inlet flow conditions has been conducted for the isothermal mixing of a single jet injected into a crossflow.

Jet penetration and mixing was studied using planar Mie scattering to measure time-averaged jet mixture fraction distributions.