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2 results

  • 4 - Free-Piston-Driven High-Enthalpy Shock Tunnels

  • Zonglin Jiang, Chinese Academy of Sciences, Beijing, Randy S. M. Chue, Nanyang Technological University, Singapore
  • Book:
    Theories and Technologies of Hypervelocity Shock Tunnels
    Published online:
    12 October 2023
    Print publication:
    26 October 2023, pp 73-118

  • Summary

    The free-piston driver is a powerful technique to increase both the driver gas sound speed and pressure. Therefore, it is capable of generating high-enthalpy flows and offering high performance among various gasdynamic shock drivers. So far, it has been implemented in a number of major reflected-shock as well as shock-expansion wind tunnels around the world. The free-piston driver has the advantage that a high driver gas pressure is automatically generated in the same process. On the other hand, the driver is far more complex mechanically and requires operation-tuning in order to operate effectively. Moreover, its test time is short and the test flow is not steady because the piston motion is difficult to control. In this chapter, the basic concepts of the free-piston driver are discussed. The analytical theory that describes the piston dynamics and the method for tuned piston operation are presented. Examples of major free-piston-driven test facilities as well as their applications in hypersonic testing are also summarized.

Theories and Technologies of Hypervelocity Shock Tunnels
  • Zonglin Jiang, Randy S. M. Chue
  • Published online:
    12 October 2023
    Print publication:
    26 October 2023
  • Learn to design and improve state-of-the-art aerodynamic ground testing facilities in this comprehensive reference book, with particular focus on high-enthalpy shock tunnels. Including the latest advances in detonation-driven high-enthalpy shock tunnels, readers will discover how to extend test time with brand new concepts and duplicate real hypersonic flight test conditions. Through a systematic approach, the book describes technologies for a variety of different drivers in hypersonic and high-enthalpy shock tunnels. The fundamental theories for hypersonic and high-enthalpy shock tunnels are described step-by-step, with examples throughout, providing an accessible introduction. Built on years of real-world experience, this book examines in detail the advantages and challenges of improving test flow qualities, including increasing total pressure and enthalpy, model scale amplification and test-time extending for different types of shock tunnel drivers. This is an ideal companion handbook for aerospace engineers as well as graduate students.