By W. Heiser, D. Pratt, D. Daley, U. Mehta

The subsequent nice jump for jet propulsion could be to power-sustained, effective flight during the surroundings. "Hypersonic Airbreathing Propulsion provides the 1st finished, unified advent to all parts of the scramjet engine that might make this feat attainable. The textual content emphasizes basic ideas, guiding techniques, analytical derivations, and numerical examples having transparent, precious, insightful effects.

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1 Static Temperature of the Atmosphere The variation of the ratio of static temperature T to the sea level value TSL with geometric altitude, taken from App. B, is shown in Fig. 2. Like many of its counterparts, it consists of a series of straight line segments, either vertical (isothermal) or inclined (gradient). Of special interest for high speed flight is the stratosphere, which consists of those exactly or nearly isothermal segments lying between approximately 36 kft (11 km) and 169 kft (52 km).

_ . z o n t a l "~/0 ,~ rc W=mg "~. Vertical Fig. 1 F o r c e s a c t i n g o n a n a e r o s p a c e v e h i c l e i n flight. TECHNICAL BACKGROUND 33 Referring to Fig. 1 and applying Newton's second law along an axis parallel to the instantaneous velocity, we find that dV m - - ~ = T - D - m g sin O (2-1) which, from the propulsion standpoint, can be interpreted to mean that the engine thrust produces vehicle acceleration while overcoming the vehicle drag and supporting part of the vehicle weight.

22 H Y P E R S O N IAIRBREATHING C PROPULSION and the size of the first step to be taken, an X-30 could fly early in the 21st century. That first step could be anywhere between a scale model scramjet carried on or launched from an aircraft or missile and the X-30 itself, and includes the possibility of a vehicle dedicated to exploring the new unknowns of hypersonic airbreathing propulsion. If the X-30 is successful, an operational space transportation vehicle could be ready in the first quarter of the 21st century.

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