Periodic shedding of vortices from the surface of a cylinder and the forces caused by these vortices for supercritical flow conditions

1971 ◽  
Vol 3 (3) ◽  
pp. 67-70 ◽  
Author(s):  
L. Kh. Blyumina ◽  
K. K. Fedyaevskii
Keyword(s):  
Flow Conditions ◽  
Supercritical Flow

Performance and Flow Characteristics of an Optimized Supercritical Compressor Stator Cascade

2005 ◽  
Vol 128 (3) ◽  
pp. 435-443 ◽  
Author(s):  
Bo Song ◽  
Wing F. Ng
Keyword(s):  
Boundary Layer ◽  
Numerical Study ◽  
Flow Behavior ◽  
Flow Characteristics ◽  
Navier Stokes ◽  
Flow Conditions ◽  
Supercritical Flow ◽  
Gradient Distribution ◽  
Controlled Diffusion ◽  
Mach Numbers

An experimental and numerical study was performed on an optimized compressor stator cascade designed to operate efficiently at high inlet Mach numbers (M1) ranging from 0.83 to 0.93 (higher supercritical flow conditions). Linear cascade tests confirmed that low losses and high turning were achieved at normal supercritical flow conditions (0.7<M1<0.8), as well as higher supercritical flow conditions (0.83<M1<0.93), both at design and off-design incidences. The performance of this optimized stator cascade is better than those reported in the literature based on Double Circular Arc (DCA) and Controlled Diffusion Airfoil (CDA) blades, where losses increase rapidly for M1>0.83. A two-dimensional (2D) Navier-Stokes solver was applied to the cascade to characterize the performance and flow behavior. Good agreement was obtained between the CFD and the experiment. Experimental loss characteristics, blade surface Mach numbers, shadowgraphs, along with CFD flowfield simulations, were presented to elucidate the flow physics. It is found that low losses are due to the well-controlled boundary layer, which is attributed to an optimum flow structure associated with the blade profile. The multishock pattern and the advantageous pressure gradient distribution on the blade are the key reasons of keeping the boundary layer from separating, which in turn accounts for the low losses at the higher supercritical flow conditions.

scholarly journals Morphodynamics and sedimentary structures of bedforms under supercritical-flow conditions: New insights from flume experiments

Sedimentology ◽  
2013 ◽  
Vol 61 (3) ◽  
pp. 712-748 ◽  
Author(s):  
Matthieu J.B. Cartigny ◽  
Dario Ventra ◽  
George Postma ◽  
Jan H. van Den Berg
Keyword(s):  
Flow Conditions ◽  
Flume Experiments ◽  
Supercritical Flow ◽  
Sedimentary Structures

Hydraulic behaviour of junction manholes under supercritical flow conditions

2012 ◽  
Vol 50 (6) ◽  
pp. 631-636 ◽  
Author(s):  
Juan Saldarriaga ◽  
Nataly Bermúdez ◽  
Diva P. Rubio
Keyword(s):  
Flow Conditions ◽  
Supercritical Flow ◽  
Hydraulic Behaviour

Performance and Flow Characteristics of an Optimized Supercritical Compressor Stator Cascade

2005 ◽  
Author(s):  
Bo Song ◽  
Wing F. Ng
Keyword(s):  
Boundary Layer ◽  
Numerical Study ◽  
Flow Behavior ◽  
Flow Characteristics ◽  
Navier Stokes ◽  
Flow Conditions ◽  
Supercritical Flow ◽  
Gradient Distribution ◽  
Controlled Diffusion ◽  
Mach Numbers

An experimental and numerical study was performed on an optimized compressor stator cascade designed to operate efficiently at high inlet Mach numbers (M1) ranging from 0.83 to 0.93 (higher supercritical flow conditions). Linear cascade tests confirmed that low losses and high turning were achieved at normal supercritical flow conditions (0.7 &lt; M1 &lt; 0.8), as well as higher supercritical flow conditions (0.83 &lt; M1 &lt; 0.93), both at design and off-design incidences. The performance of this optimized stator cascade is better than those reported in the literature based on Double Circular Arc (DCA) and Controlled Diffusion Airfoil (CDA) blades, where losses increase rapidly for M1 &gt; 0.83. A 2-D Navier-Stokes solver was applied to the cascade to characterize the performance and flow behavior. Good agreement was obtained between the CFD and the experiment. Experimental loss characteristics, blade surface Mach numbers, shadowgraphs, along with CFD flowfield simulations, were presented to elucidate the flow physics. It is found that low losses are due to the well-controlled boundary layer, which is attributed to an optimum flow structure associated with the blade profile. The multi-shock pattern and the advantageous pressure gradient distribution on the blade are the key reasons of keeping the boundary layer from separating, which in turn accounts for the low losses at the higher supercritical flow conditions.

scholarly journals Determination of the critical rate of hydrotransport based on measurements in supercritical flow conditions

2019 ◽  
Vol 109 ◽  
pp. 00082
Author(s):  
Yevhen Semenenko ◽  
Serhii Dziuba ◽  
Larysa Tatarko ◽  
Zinaida Yakubovska
Keyword(s):  
Relative Error ◽  
Metallurgical Plant ◽  
Flow Conditions ◽  
Critical Rate ◽  
Actual Problem ◽  
Supercritical Conditions ◽  
Supercritical Flow ◽  
Freight Traffic ◽  
Methodical Approach

The article solves the actual problem of determining the value of the critical rate of hydrotransport for a specific hydrotransport unit in terms of its operation in supercritical flow conditions, without violating the process regulations and the required freight traffic for processing. Based on the analysis and generalization of the known methods of calculating the parameters of hydrotransport, a methodical approach was proposed for determining the value of the critical rate of hydrotransportation according to the dependence of the hydraulic slope on the speed and concentration of the slurry. The efficiency of the developed methodology was proved based on the results of measurements of the parameters of the Vilnohirsk State Mining and Metallurgical Plant hydrotransport complex in supercritical conditions. The reliability of the developed technique is confirmed by the fact that the relative error in determining the critical rate of hydrotransport according to the methods improved by the author does not exceed 7 %, and in determining the hydraulic slope does not exceed 6 %, respectively.

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