A preliminary investigation of cold gas injection into a forward-facing cavity in hypersonic flow

1997 ◽  
Author(s):  
Sidra Silton ◽  
David Goldstein ◽  
Sidra Silton ◽  
David Goldstein
Keyword(s):  
Hypersonic Flow ◽  
Preliminary Investigation ◽  
Gas Injection ◽  
Cold Gas

Cold Gas Injection for Erosion Protection

1978 ◽  
Vol 15 (1) ◽  
pp. 22-26
Author(s):  
D. Siegelman ◽  
A. Pallone
Keyword(s):  
Gas Injection ◽  
Erosion Protection ◽  
Cold Gas

scholarly journals Experimental Study of Artificial Ground Freezing by Natural Cold Gas Injection

2020 ◽  
Vol 10 (17) ◽  
pp. 6055
Author(s):  
Zhao Liu ◽  
Youhong Sun ◽  
Bingge Wang ◽  
Qiang Li
Keyword(s):  
Phase Transition ◽  
Gas Flow ◽  
Gas Injection ◽  
Freezing Rate ◽  
New Method ◽  
Cooling Stage ◽  
Ground Freezing ◽  
Artificial Ground Freezing ◽  
Time Required ◽  
Cold Gas

The application of conventional artificial ground freezing (AGF) has two disadvantages: low freezing rate and small frozen range. In this study, a new method with natural cold gas injection was proposed, whereby the shallow soils and water can be frozen rapidly due to the effect of the heat convection. Cold gas from −15 °C to −10 °C, in the winter of northeast China, was injected into the laboratory-scale sand pipe; evolution of the induced frozen front and water migration were studied, and then, the feasibility of the new method was analyzed. According to the evolution of the induced frozen front, the freezing process was divided into an initial cooling stage, phase transition stage, and subcooled stage. The results showed that the increase of initial water content at the beginning of the experiments had little effect on the time required for completing the initial cooling stage, while the time required for the phase transition would increase in nearly the same proportion. In addition, the increase of the cold gas flow rate could not only strengthen the cooling rate of the initial cooling stage but also shorten the phase transition time; thereby, the freezing rate was increased. The freezing rate could reach 0.18–0.61 cm/min in the direction of cold gas flow, and compared to the conventional AGF (months are required for approximately 1 m), the freezing efficiency was greatly improved.

Volt-Ampere and Thermal Features of a Direct-Current Dual-Jet Plasma Generator With a Cold Gas Injection

2010 ◽  
Vol 38 (10) ◽  
pp. 2906-2913 ◽  
Author(s):  
Zhe Wang ◽  
Gui-Qing Wu ◽  
Nan Ge ◽  
He-Ping Li ◽  
Cheng-Yu Bao
Keyword(s):  
Direct Current ◽  
Gas Injection ◽  
Plasma Generator ◽  
Thermal Features ◽  
Jet Plasma ◽  
Cold Gas

Study of Direct Gas Injection into stagnation zone of Blunt Nose at Hypersonic Flow

2021 ◽  
Author(s):  
Peter Harmon ◽  
Ashish Vashishtha ◽  
Dean Callaghan ◽  
Cathal Nolan ◽  
Ralf Deiterding
Keyword(s):  
Hypersonic Flow ◽  
Gas Injection ◽  
Stagnation Zone ◽  
Blunt Nose
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