A volcanic blast induces a velocity to the right along the ground of 200 m/s. The...

 

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A volcanic blast induces a velocity to the right along the ground of 200 m/s. The air preceding the blast has a wind velocity of 20 m/s to the left relative to the ground, and is at static conditions of 100 kPa and 300 K. The two regions must be separated by a wave or series of waves propagating to the right, as shown. (a) What kind of wave(s) is this, a normal shock wave or series of expansion waves? Why? (b) If it is a normal shock, find its velocity relative to the ground. If they are expansion waves, find the velocity of the leading and trailing waves in the series relative to the ground. (c) Find the static pressure and static temperature behind (i.e., to the left of) the wave(s). (d) Find the stagnation pressure and stagnation temperature of the air behind (to the left) of the wave(s), relative to the ground. A volcanic blast induces a velocity to the right along the ground of 200 m/s. The air preceding the blast has a wind velocity of 20 m/s to the left relative to the ground, and is at static conditions of 100 kPa and 300 K. The two regions must be separated by a wave or series of waves propagating to the right, as shown. (a) What kind of wave(s) is this, a normal shock wave or series of expansion waves? Why? (b) If it is a normal shock, find its velocity relative to the ground. If they are expansion waves, find the velocity of the leading and trailing waves in the series relative to the ground. (c) Find the static pressure and static temperature behind (i.e., to the left of) the wave(s). (d) Find the stagnation pressure and stagnation temperature of the air behind (to the left) of the wave(s), relative to the ground.