Examples of schlieren

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Perhaps the most noticeable feature in this schlieren record is the excellent symmetry of the flow.
The irregularities in a horizontal plane at right angles to the optical path would then give the appearance of multiple shocks in a schlieren photograph.
The shadowgraph and schlieren photographs have features similar t o those observed in this type of flow by other experimenters.
Both schlieren and shadow photographs were taken of the flow, the schlieren arrangement being of the double pass type.
Figure 5 is a sketch of the wave field derived from the present schlieren photographs.
The radial distance and time scales indicated in the explanatory diagram of figure 10 apply to all the schlieren photographs.
A schlieren photograph of one of the altitude scaling experiments has also been included for comparison in the above figure.
A spark column, consisting of hot gas, can be observed by means of a schlieren system.
The motion of this jet element can then be observed with the aid of a schlieren system.
The light source for the schlieren system in these experiments is a pulsed copper-vapor laser.
The jet was visualized with a 2-type schlieren system with f 110 mirrors of diameter 100 mm.
The spark-heated column of air is clearly visible on schlieren photographs obtained with a short-duration spark light source.
The schlieren records show the shock wave to be formed after about 200psec, and to have achieved its maximum velocity at this time.
Let xs be the distance of the shock wave from the spark gap at the time the schlieren photograph is taken.
Schlieren records were obtained of a number of trial air and helium-sphere explosions at several initial sphere pressures.
I n addition, streak schlieren photographs of the collapse phenomenon have been obtained using a rotating-drum camera.

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