Vortical regime of the flow behind the bow shock wave

Shock Waves ◽  
2001 ◽  
Vol 11 (3) ◽  
pp. 229-244 ◽  
Author(s):  
V. Svetsov
Keyword(s):  
Shock Wave ◽  
Bow Shock ◽  
Bow Shock Wave

scholarly journals On the vorticity behind 3-D detached bow shock wave

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
V. N. Golubkin ◽  
G. B. Sizykh
Keyword(s):  
Shock Wave ◽  
Bow Shock ◽  
Bow Shock Wave

scholarly journals Multi-Component MHD Model of Hot Jupiter Envelopes

Universe ◽  
2021 ◽  
Vol 7 (11) ◽  
pp. 422
Author(s):  
Andrey Zhilkin ◽  
Dmitri Bisikalo
Keyword(s):  
Magnetic Field ◽  
Shock Wave ◽  
Numerical Model ◽  
Stellar Wind ◽  
Bow Shock ◽  
Model Description ◽  
Hot Jupiters ◽  
Bow Shock Wave ◽  
Field Lines ◽  
Hot Jupiter

A numerical model description of a hot Jupiter extended envelope based on the approximation of multi-component magnetic hydrodynamics is presented. The main attention is focused on the problem of implementing the completed MHD stellar wind model. As a result, the numerical model becomes applicable for calculating the structure of the extended envelope of hot Jupiters not only in the super-Alfvén and sub-Alfvén regimes of the stellar wind flow around and in the trans-Alfvén regime. The multi-component MHD approximation allows the consideration of changes in the chemical composition of hydrogen–helium envelopes of hot Jupiters. The results of calculations show that, in the case of a super-Alfvén flow regime, all the previously discovered types of extended gas-dynamic envelopes are realized in the new numerical model. With an increase in magnitude of the wind magnetic field, the extended envelope tends to become more closed. Under the influence of a strong magnetic field of the stellar wind, the envelope matter does not move along the ballistic trajectory but along the magnetic field lines of the wind toward the host star. This corresponds to an additional (sub-Alfvénic) envelope type of hot Jupiters, which has specific observational features. In the transient (trans-Alfvén) mode, a bow shock wave has a fragmentary nature. In the fully sub-Alfvén regime, the bow shock wave is not formed, and the flow structure is shock-less.

scholarly journals Unsteady flow mechanisms in the last stage of a transonic low pressure steam turbine—multistage effects and tip leakage flows

2017 ◽  
Vol 1 ◽  
pp. F4IW8S
Author(s):  
Ilias Papagiannis ◽  
Asad Raheem ◽  
Altug Basol ◽  
Anestis Kalfas ◽  
Reza Abhari ◽  
...  
Keyword(s):  
Shock Wave ◽  
Steam Turbine ◽  
Leading Edge ◽  
Bow Shock ◽  
Leakage Flow ◽  
Tip Leakage Flow ◽  
Tip Leakage ◽  
Bow Shock Wave ◽  
Last Stage ◽  
Two Stages

Abstract In this paper, an unsteady investigation of the last two stages of a low-pressure steam turbine with supersonic airfoils near the tip of the last stage’s rotor blade is presented. Goal is the investigation of multistage effects and tip leakage flow in the last stage of the turbine and to provide insight on the stator-rotor flow interaction in the presence of a bow-shock wave. This study is unique in a sense of combining experimental data for code validation and comparison with a numerical simulation of the last two stages of a real steam turbine, including tip-cavity paths and seals, steam modelling and experimental data used as inlet and outlet boundary conditions. Analysis of results shows high unsteadiness close to the tip of the last stage, due to the presence of a bow-shock wave upstream of the rotor blade leading edge and its interaction with the upstream stator blades, but no boundary layer separation on stator is detected at any instant in time. The intensity of the shock wave is weakest, when the axial distance of the rotor leading edge from the upstream stator trailing edge is largest, since it has more space available to weaken. However, a phase shift between the maximum values of static pressure along the suction side of the stator blade is identified, due to the shock wave moving with the rotor blades. Additionally, the bow-shock wave interacts with the blade shroud and the tip leakage flow. Despite the interaction with the incoming flow, the total tip leakage mass flow ingested in the tip-cavity shows a steady behaviour with extremely low fluctuations in time. Finally, traces of upstream stage’s leakage flow have been identified in the last stage, contributing to entropy generation in inlet and outlet of last stage’s stator blade, highlighting the importance of performing multistage simulations.

The upstream region, foreshock and bow shock wave at comet P/Halley from plasma electron measurements

1988 ◽  
pp. 290-292 ◽  
Author(s):  
K. A. Anderson ◽  
C. W. Carlson ◽  
D. W. Curtis ◽  
R. P. Lin ◽  
H. Rème ◽  
...  
Keyword(s):  
Shock Wave ◽  
Plasma Electron ◽  
Bow Shock ◽  
Upstream Region ◽  
Bow Shock Wave

Bow Shock Wave Mitigation by Laser-Plasma Energy Addition in Hypersonic Flow

2008 ◽  
Vol 45 (5) ◽  
pp. 921-927 ◽  
Author(s):  
A. C. Oliveira ◽  
M. A. S. Minucci ◽  
P. G. P. Toro ◽  
J. B. Chanes ◽  
L. N. Myrabo ◽  
...  
Keyword(s):  
Shock Wave ◽  
Hypersonic Flow ◽  
Laser Plasma ◽  
Bow Shock ◽  
Plasma Energy ◽  
Bow Shock Wave ◽  
Energy Addition ◽  
Shock Wave Mitigation

XXVII.—The Rotational Field behind a Bow Shock Wave in Axially Symmetric Flow using Relaxation Methods

1952 ◽  
Vol 63 (4) ◽  
pp. 371-380
Author(s):  
A. R. Mitchell ◽  
Francis McCall
Keyword(s):  
Shock Wave ◽  
Mach Number ◽  
Supersonic Flow ◽  
Bow Shock ◽  
Axially Symmetric ◽  
Relaxation Methods ◽  
Bow Shock Wave ◽  
Constant Vorticity ◽  
Complete Field ◽  
Rotational Field

SynopsisThe relaxation technique of R. V. Southwell is developed to evaluate mixed subsonic-supersonic flow regions with axial symmetry, changes of entropy being taken into account. In the problem of a parallel supersonic flow of Mach number I·8 impinging on a blunt-nosed axially symmetric obstacle, the new technique is used to determine the complete field downstream of the bow shock wave formed. Lines of constant vorticity and Mach number are shown in the field, and where possible a comparison is made with the corresponding 2-dimensional problem.

The Martian bow shock: Wave observations in the upstream region

1992 ◽  
Vol 97 (A3) ◽  
pp. 2927-2933 ◽  
Author(s):  
A. Skalsky ◽  
R. Grard ◽  
S. Klimov ◽  
C. M. C. Nairn ◽  
J. G. Trotignon ◽  
...  
Keyword(s):  
Shock Wave ◽  
Bow Shock ◽  
Upstream Region ◽  
Bow Shock Wave
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