scholarly journals Passive control of base pressure on an axisymmetric blunt body using a perimetric slit

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Juan Marcos García de la Cruz ◽  
Anthony R. Oxlade ◽  
Jonathan F. Morrison
Keyword(s):  
Blunt Body ◽  
Passive Control ◽  
Base Pressure

Passive Control of Transonic Flow over a Blunt Body Using Aerospikes

2020 ◽  
Vol 57 (5) ◽  
pp. 945-955
Author(s):  
Gireesh Yanamashetti ◽  
D. B. Singh ◽  
G. K. Suryanarayana ◽  
Rinku Mukherjee
Keyword(s):  
Transonic Flow ◽  
Blunt Body ◽  
Passive Control

scholarly journals Passive Control of Base Pressure: A Review

2021 ◽  
Vol 11 (3) ◽  
pp. 1334
Author(s):  
Ambareen Khan ◽  
Parvathy Rajendran ◽  
Junior Sarjit Singh Sidhu
Keyword(s):  
Internal Combustion Engines ◽  
Passive Control ◽  
Control Device ◽  
Base Pressure ◽  
Combustion Engines ◽  
Favorable Pressure Gradient ◽  
Management Techniques ◽  
Base Drag ◽  
Present World ◽  
Control Management

In the present world, passive control finds application in various areas like flow over blunt projectiles, missiles, supersonic parallel diffusers (for cruise correction), the engine of jets, static testbeds of rockets, the ports of internal combustion engines, vernier rockets, and single expansion ramp nozzle (SERN) rockets. In this review, various passive control techniques to control the base pressure and regulate the drag force are discussed. In the study, papers ranging from subsonic, sonic, and supersonic flow are discussed. Different types of passive control management techniques like cavity, ribs, dimple, static cylinder, spikes, etc., are discussed in this review article. This study found that the passive control device can control the base pressure, resulting in an enhancement in the base pressure and reducing the base drag. Also, passive control is very efficient whenever there is a favorable pressure gradient at the nozzle exit.

scholarly journals Passive control of base pressure with static cylinder at supersonic flow

2018 ◽  
Vol 370 ◽  
pp. 012050 ◽  
Author(s):  
Mohammed Asadullah ◽  
S A Khan ◽  
Waqar Asrar ◽  
E Sulaeman
Keyword(s):  
Supersonic Flow ◽  
Passive Control ◽  
Base Pressure

Direct STEM ADF imaging of gold on silicon (111)

1989 ◽  
Vol 47 ◽  
pp. 472-473
Author(s):  
P. Xu ◽  
E. J. Kirkland ◽  
J. Silcox
Keyword(s):  
Film Growth ◽  
Heavy Atom ◽  
High Vacuum ◽  
Dark Field ◽  
Thin Metal Film ◽  
Base Pressure ◽  
Ultra High Vacuum ◽  
Specimen Preparation ◽  
Dark Field Imaging ◽  
Wide Range

Many studies of thin metal film growth and the formation of metal-semiconductor contacts have been performed using a wide range of experimental methods. STEM annular dark field imaging could be an important complement since it may allow direct imaging of a single heavy atom on a thin silicon substrate. This would enable studies of the local atomic arrangements and defects in the initial stage of metal silicide formation.Preliminary experiments were performed in an ultra-high vacuum VG HB501A STEM with a base pressure of 1 × 10-10 mbar. An antechamber directly attached to the microscope for specimen preparation has a base pressure of 2×l0-10 mbar. A thin single crystal membrane was fabricated by anodic etching and subsequent reactive etching. The specimen was cleaned by the Shiraki method and had a very thin oxide layer left on the surface. 5 Å of gold was deposited on the specimen at room temperature from a tungsten filament coil monitored by a quartz crystal monitor.

Passive Control of a Hydraulic Valve

1989 ◽  
Author(s):  
John D. Charlton ◽  
James J. Brickley
Keyword(s):  
Passive Control ◽  
Hydraulic Valve

Blunt-body wave drag reduction using focused energy deposition

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 460-467 ◽  
Author(s):  
David Riggins ◽  
H. F. Nelson ◽  
Eric Johnson
Keyword(s):  
Drag Reduction ◽  
Energy Deposition ◽  
Blunt Body ◽  
Body Wave ◽  
Wave Drag ◽  
Wave Drag Reduction
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