On the transition between regular and Mach reflection in truly non-stationary flows

1981 ◽  
Vol 108 ◽  
pp. 383-400 ◽  
Author(s):  
S. Itoh ◽  
N. Okazaki ◽  
M. Itaya
Keyword(s):  
Shock Tube ◽  
Mach Reflection ◽  
Experimental Results ◽  
Dry Air ◽  
Stationary Flows ◽  
Transition Criteria ◽  
Shock Reflections ◽  
Pressure Driven

Shock reflections over a convex and a concave wedge were investigated by using a 5 × 7 cm ordinary pressure-driven shock tube. Dry air was used for both the driving and driven gases. The large difference between the transition from regular (RR) to Mach reflection (MR) and that from MR to RR was observed, confirming the results obtained by Ben-Dor, Takayama & Kawauchi (1980). These results contradict all of the previous theoretical transition criteria. A new theory on the transition between RR and MR was developed by applying Whitham's ‘ray shock’ theory. This new theory agrees quite well with the experimental results.

The Propagation of Compressional Waves in a Dispersive Elastic Rod: Part II—Experimental Results and Comparison With Theory

1957 ◽  
Vol 24 (2) ◽  
pp. 240-244
Author(s):  
Julius Miklowitz ◽  
C. R. Nisewanger
Keyword(s):  
Shock Tube ◽  
Longitudinal Mode ◽  
Long Waves ◽  
Experimental Results ◽  
Radial Mode ◽  
Approximate Representation ◽  
Elastic Rod ◽  
Compressional Waves ◽  
Short Waves

Abstract Experimental results, obtained by employing an aerodynamic shock tube for rod excitation, are presented. Comparison of these results with the theoretical information presented in Part I is made. It is shown that the Mindlin-Herrmann theory, through its upper mode (radial), offers a good approximate representation of the moderately short waves that predominate at the later times at a random station of the rod. The very short waves of this same radial mode, however, govern the early disturbance, thus precluding the possibility of representing this portion of the disturbance, which the experiment shows to be composed of relatively long waves, by the longitudinal mode of the theory.

Shock formation distance in a pressure driven shock tube

1976 ◽  
Vol 19 (12) ◽  
pp. 1885 ◽  
Author(s):  
E. M. Rothkopf ◽  
W. Low
Keyword(s):  
Shock Tube ◽  
Shock Formation ◽  
Pressure Driven

Benzene Oxidation: Experimental Results in a JDR and Comprehensive Kinetic Modeling in JSR, Shock-Tube and Flame

2001 ◽  
Vol 167 (1) ◽  
pp. 223-256 ◽  
Author(s):  
A. RISTORI ◽  
P. DAGAUT ◽  
A. EL BAKALI ◽  
G. PENGLOAN ◽  
M. CATHONNET
Keyword(s):  
Shock Tube ◽  
Kinetic Modeling ◽  
Experimental Results ◽  
Benzene Oxidation

Comment on Precursors in a Pressure Driven Shock Tube

AIAA Journal ◽  
1968 ◽  
Vol 6 (2) ◽  
pp. 382-382 ◽  
Author(s):  
SAMUEL LEDERMAN ◽  
DANIEL S. WILSON
Keyword(s):  
Shock Tube ◽  
Pressure Driven

Observation and analysis of the Mach reflection of weak uniform plane shock waves. Part 2. Analysis

1985 ◽  
Vol 152 ◽  
pp. 67-81 ◽  
Author(s):  
J. M. Dewey ◽  
D. J. Mcmillin
Keyword(s):  
Mach Reflection ◽  
Grazing Incidence ◽  
Experimental Results ◽  
Plane Shock ◽  
Stationary Model ◽  
Reflected Shock ◽  
Parallel Flows ◽  
Weak Plane ◽  
Spatially Varying ◽  
Limiting Case

A non-stationary approach to the reflection of weak plane shocks is suggested as an alternative to the usual pseudo-stationary transformation. For regular reflection the non-stationary model produces results which are identical to those obtained using the pseudo-stationary assumption, but with simpler algebra. For weak Mach reflections, where the predictions of the pseudo-stationary model are in disagreement with experimental results, the non-stationary model predicts accurately the observed shapes and positions of the reflected and Mach stem shocks and the spatially varying flow properties behind these shocks. However, the non-stationary model predicts that the gas flows above and below the contact surface, relative to the triple point, are not quite parallel. Parallel flows could be obtained only in the limiting case of grazing incidence, when the reflected shock was sonic. The model is based on the experimental results presented in Part 1 of this paper.

scholarly journals Photodegradation of Gas Phase Benzene by SnO2 Nanoparticles by Direct Hole Oxidation Mechanism

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 117 ◽  
Author(s):  
Shi Chen ◽  
Zhiguo Sun ◽  
Li Zhang ◽  
Hongyong Xie
Keyword(s):  
Gas Phase ◽  
Sno2 Nanoparticles ◽  
Turbulent Flame ◽  
Oxidation Mechanism ◽  
Experimental Results ◽  
Stannic Chloride ◽  
Oh Radical ◽  
Photocatalytic Process ◽  
Dry Air ◽  
Efficient Alternative

Photodegradation of gas phase benzene by SnO2 nanoparticles has been studied in humid air, dry air and N2 by using a tubular photoreactor. The SnO2 nanoparticles are synthesized by the oxidation of anhydrous stannic chloride (SnCl4) in a propane/air turbulent flame. Direct hole oxidation and the ·OH radical mechanisms have been discussed based on experimental results. The goal of this research is to explore a viable and efficient alternative photocatalyst and photocatalytic process, in particular, for humidity-tolerant photocatalyst or photocatalytic process in environmental applications.

Effect of a Continuous Area Convergence on the Motion of a Shock Wave

1969 ◽  
Vol 20 (3) ◽  
pp. 248-258 ◽  
Author(s):  
P. L. Wilcox
Keyword(s):  
Shock Wave ◽  
Shock Tube ◽  
Experimental Work ◽  
Method Of Characteristics ◽  
Unsteady Motion ◽  
Experimental Results ◽  
Area Change ◽  
Transient Motion ◽  
The Method Of Characteristics ◽  
Good Agreement

SummaryThe transient motion of a shock wave is investigated during its passage through ducts containing various area convergences. The method of characteristics has been used to follow the unsteady motion of the shock wave in an inviscid, non-conducting gas. The strength of the shock is taken to be large enough so that initially both sets of characteristics face downstream. The results are found to be in good agreement with unsteady and quasi-steady theories. A comparison is made between the characteristics results and experimental results obtained in a 1 ft (0·305 m) diameter shock tube. This shock tube incorporates a 3·75:1 linear area change in the low pressure section length. Good agreement is found between experiment and theory. A comparison is also made with other experimental work.

scholarly journals Survey of CO2 Radiation Experimental Data in Relation with Planetary Entry

Galaxies ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 15
Author(s):  
Philippe Reynier
Keyword(s):  
Experimental Data ◽  
Shock Tube ◽  
Experimental Results ◽  
Plasma Radiation ◽  
Plasma Arc ◽  
Expansion Tube ◽  
Plasma Flows ◽  
Ir Radiation ◽  
Co2 Plasma ◽  
Future Test

This paper focuses on a survey of experimental data related to radiation into CO2 plasma flows, which are encountered during Mars and Venus entries. The review emphasizes on VUV and IR radiation, since recent experimental efforts has been devoted to these wavelength ranges since they contribute mostly to CO2 plasma radiation. The main objective of the study is to identify the most attractive datasets for future crosscheck comparisons with the results obtained during future test campaigns with ESTHER shock-tube. The survey accounts for the results obtained in shock-tubes, expansion tube and plasma arc-jets for Mars and Venus test campaigns. The experimental results obtained for propulsion related studies have also been considered.

Sign in / Sign up

Export Citation Format

Share Document