This book summarizes the basic achievements in the research field of serpentine nozzles, three-axis vectoring nozzles, and single expansion ramp nozzles, in order to provide theoretical basis and technical support for the application of special types of nozzles in aviation engines under different task requirements. It is based on the research results of the Jet Propulsion Theory and Engineering Research Institute of Northwestern Polytechnical University, combined with the latest research status. It is a valuable reference for scientific and technological personnel in related technical fields, and convenient for readers to have a deeper understanding of the basic knowledge and theory related to special-purpose nozzles, and to help carry out relevant design and application research.