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Control of Entropy Generation due to Shock

Control of Entropy Generation due to Shock. P M V Subbarao Professor Mechanical Engineering Department. Tame the Normal Shock to Reduce Irreversibility !!!. Measure of Loss due to Shock. Before the shock:. After the shock:. Across the shock:.

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Control of Entropy Generation due to Shock

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  1. Control of Entropy Generation due to Shock P M V Subbarao Professor Mechanical Engineering Department Tame the Normal Shock to Reduce Irreversibility !!!

  2. Measure of Loss due to Shock Before the shock: After the shock: Across the shock:

  3. Mach Number Vs Total Pressure : Normal Shock

  4. Mach Number Vs Entropy Generation : Normal Shock

  5. Inlets for Supersonic Vehicles

  6. Oblique Shock Wave • When generating object is smaller than a “bluff body”, shockwave can be weaker than NS but stronger than the Mach wave. This is called as Oblique shock wave • q-- turning angle or “wedge angle” b -- shock angle

  7. Flow Through A Supersonic Ramjet (Missile) What about another Thought Experiment ???

  8. Geometrical Description of An Oblique Shock Wave wx b b-q ux u wx y b-q q

  9. Tangential Normal Ahead wx, Mtx ux, Mnx Of Shock Behind wy, Mty uy, Mny Shock Oblique Shock Wave as a Control Volume x y uy & Mny wx & Mtx ux & Mnx wy & Mty Vy & My Vx & Mx • Shock is A CV & Must satisfy i) continuity ii) momentum iii) energy

  10. Continuity Equation for Oblique Shock Wave wy Vy wx Vx uy ux x y • For Steady Flow thru an Oblique Shock

  11. • For Steady Flow w/o Body Forces ( ) - r + r = u w A u w A x x x y y y Momentum Equation for Oblique Shock Wave wy Vy wx Vx uy ux x y • Tangential Component

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