scholarly journals Correlation of flight effects on centerline velocity decay for cold‐flow acoustically excited jets

1983 ◽  
Vol 74 (S1) ◽  
pp. S113-S113
Author(s):  
Uwe H. von Glahn
Keyword(s):  
Centerline Velocity ◽  
Cold Flow ◽  
Velocity Decay

Mixing Characteristics of Elliptical and Rectangular Subsonic Jets with Swirling Co-flow

2015 ◽  
Vol 32 (1) ◽  
Author(s):  
S. Gopinath ◽  
M. Sundararaj ◽  
S. Elangovan ◽  
E. Rathakrishnan
Keyword(s):  
Decay Rate ◽  
Spreading Rate ◽  
Equivalent Diameter ◽  
Centerline Velocity ◽  
Potential Core ◽  
Mass Entrainment ◽  
Velocity Decay ◽  
Vector Plot ◽  
Equivalent Area ◽  
Flow Duct

AbstractThis paper presents a computational analysis of effects of swirling co-flow and non-circular subsonic compressible inner jets on centerline velocity decay, mass entrainment and jet spreading rate. Three different exit shapes of elliptical, rectangular and circular inner jets were compared for three different co-flow conditions such as no co-flow, straight co-flow and swirling co-flow. Co-flow is issuing from a circular annular duct. Swirling co-flow is created in the co-flow duct by introducing a swirler with stationary angular vanes of 50° oblique to the jet axis. Reynolds number of inner jet is calculated based on its equivalent diameter as 200342. It is found that the swirling co-flow has strong influence on the boundary condition of inner jet and alters the major features of the jet such as jet potential core length, centerline velocity decay rate and jet spread rate. Streamwise corner vortices of different jet conditions have been captured using velocity vector plot to show the effect of swirling co-flow on the jet flow field. Swirling co-flow with elliptical inner jet exhibits higher velocity decay rate and jet spreading rate than the equivalent area circular and rectangular jet.

Mean Streamwise Centerline Velocity Decay and Entrainment in Triangular and Circular Jets

AIAA Journal ◽  
2013 ◽  
Vol 51 (1) ◽  
pp. 70-79 ◽  
Author(s):  
W. R. Quinn ◽  
M. Azad ◽  
D. Groulx
Keyword(s):  
Centerline Velocity ◽  
Circular Jets ◽  
Velocity Decay

scholarly journals The jet centerline velocity decay method for noninvasive calculation of aortic regurgitant volume

1996 ◽  
Vol 27 (2) ◽  
pp. 395 ◽  
Author(s):  
Russell S. Heinrich ◽  
Michael Jones ◽  
Izumi Yamada ◽  
Jennifer McGhee ◽  
Takahiro Shiota ◽  
...  
Keyword(s):  
Centerline Velocity ◽  
Regurgitant Volume ◽  
Velocity Decay

scholarly journals Centerline velocity decay of a circular jet in a counterflowing stream

1998 ◽  
Vol 10 (3) ◽  
pp. 637-644 ◽  
Author(s):  
C. H. C. Chan ◽  
K. M. Lam
Keyword(s):  
Centerline Velocity ◽  
Velocity Decay

Centerline Velocity Decay of Compressible Free Jets

AIAA Journal ◽  
1974 ◽  
Vol 12 (4) ◽  
pp. 417-418 ◽  
Author(s):  
PETER O. WITZE
Keyword(s):  
Centerline Velocity ◽  
Free Jets ◽  
Velocity Decay

Cold Flow Simulation in Underground Coal Gasification (UCG) Cavities

2014 ◽  
Vol 1 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Dipankar Chatterjee ◽  
◽  
Satish Gupta ◽  
Chebolu Aravind ◽  
Rakesh Roshan
Keyword(s):  
Coal Gasification ◽  
Flow Simulation ◽  
Underground Coal Gasification ◽  
Cold Flow

Numerical Studies on Trapped-Vortex Concepts for Stable Combustion

1998 ◽  
Vol 120 (1) ◽  
pp. 60-68 ◽  
Author(s):  
V. R. Katta ◽  
W. M. Roquemore
Keyword(s):  
Drag Coefficient ◽  
Reacting Flow ◽  
Flow Conditions ◽  
Third Order ◽  
Cold Flow ◽  
Flow Simulations ◽  
Numerical Studies ◽  
Dynamic Flows ◽  
Experimental Findings ◽  
Trapped Vortex

Spatially locked vortices in the cavities of a combustor aid in stabilizing the flames. On the other hand, these stationary vortices also restrict the entrainment of the main air into the cavity. For obtaining good performance characteristics in a trapped-vortex combustor, a sufficient amount of fuel and air must be injected directly into the cavity. This paper describes a numerical investigation performed to understand better the entrainment and residence-time characteristics of cavity flows for different cavity and spindle sizes. A third-order-accurate time-dependent Computational Fluid Dynamics with Chemistry (CFDC) code was used for simulating the dynamic flows associated with forebody-spindle-disk geometry. It was found from the nonreacting flow simulations that the drag coefficient decreases with cavity length and that an optimum size exists for achieving a minimum value. These observations support the earlier experimental findings of Little and Whipkey (1979). At the optimum disk location, the vortices inside the cavity and behind the disk are spatially locked. It was also found that for cavity sizes slightly larger than the optimum, even though the vortices are spatially locked, the drag coefficient increases significantly. Entrainment of the main flow was observed to be greater into the smaller-than-optimum cavities. The reacting-flow calculations indicate that the dynamic vortices developed inside the cavity with the injection of fuel and air do not shed, even though the cavity size was determined based on cold-flow conditions.

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