HISST 2024

This workshop is concerned primarily with the design of compression systems for ramjet and scramjet engines. Efficient combustion of fuel requires that airflow be supplied to the combustor of these engines at a suitable pressure, temperature, and mass flow rate. For both ramjet and scramjets the propel vehicles traveling at high speed and at altitudes in the airbreathing flight corridor, this requires significant compression and heating of the air.

The performance of ramjet and scramjet intakes can be described by two key parameters: 1) capability, or how much compression is performed, and 2) efficiency, or what level of flow losses does the intake generate during the compression process. Meaningful discussions of intake performance must include both parameters as, for example, a highly efficient intake can be very easily designed if it is required to do little compression.

There are numerous practical constraints on the compression level of a ramjet or scramjet intakes that must be considered in the design of an operational engine. The most important of these are 1) delivery of flow conditions for robust combustion, 2) operability limits related to intake starting and boundary-layer separation, 3) aerothermal loads and high temperature structures and 4) nonequilibrium flow effects in the nozzle.

The focus of this workshop is on a number of topics that remain a focus for modern high speed intake design for operational ramjet and scramjet engines. These are:


Discussion concerning these and related high speed intake topics will be most welcome.

Materials and Structures are often viewed as one of the top technical challenges associated with high-speed flight. Correspondingly, there is a significant amount of work being performed in many countries. The rich diversity of topics and significant body of work provide fertile ground for the technical community to explore together to mutual benefit. Therefore, the Materials and Structures Workshop is intended to facilitate discussion regarding the top challenges, to be organized according to relevance to high-speed flight in the short-term (0-5 years), medium-term (5-15 years), and long-term (15+ years). A summary white paper will be published after the conference for the benefit of the technical community.

High-speed vehicle materials and structures must sustain thermal loads that include high temperatures, gradients, peak heating, and total heat load. The structures must also endure structural loads that can include quasi-static, dynamic, thermal expansion, and acoustic components. Additionally, chemical considerations from the flowfield and any propulsion components add another layer of complexity. The multidisciplinary analyses used to design the structures are challenging to validate, and often require a combination of ground and flight tests to verify performance. Inspection of the assemblies and composite material systems can prove challenging to verify build integrity and suitability for flight. Discussion concerning these and related materials and structures topics will be most welcome.

Topics include, but are not limited to:

This workshop is dedicated to all different aspects that come into play during the conception of hypersonic flight experiments.

Although hypersonic in-flight testing is typically challenging and expansive, it offers unique characteristics and is complementary to ground testing in hypersonic facilities. The goal of flight testing could be to investigate real hypersonic phenomena than can be difficult to simulate in wind tunnels; to evaluate a system and the challenges associated with “long-duration flight environment” or to demonstrate the capabilities of an operational vehicle & launch system.

The investigation of some fundamental hypersonic phenomena can be difficult to perform in ground facility due to limitations in terms of model size, test duration and test conditions. Often, the only way to replicate all aspects in through flight testing. The development of different flight-test platforms and non-intrusive measurement techniques will be covered in this workshop.

Preparing for a long-duration (compared to wind tunnel) science-in-the-sky experiments or operational system demonstration requires the careful consideration of a variety of different aspects including:


This workshop will discuss all these aspects, the latest associated advancements & challenges and identify the critical point and the next steps to be taken on the short and long term.

Organizers:
Prof. Yue Huang (Xiamen University)
Prof. Hyungrok Do (Seoul National University)

This workshop is dedicated to all the different aspects related to the fundamentals of detonation and the applications of detonative propulsion.

Detonation is characterized by the simultaneous propagation of a supersonic combustion wave and a leading shock wave. The coupling of these waves results in rapid changes in thermodynamic states, accompanied by fast energy release. Unlike subsonic deflagration, detonation is recognized as a pressure-gain, self-sustaining reacting flow. Detonative engines, utilizing pressure-gain combustion (PGC), have been explored as feasible alternatives to current propulsion employing pressure-constant combustion.

Different types of detonative engines have been proposed and developed over the past few decades. The detonation engines have drawn significant attention in recent years while underscoring the importance of sharing the latest research findings. Furthermore, the performance gains achievable through the detonative engines are still not fully understood. Conducting experimental measurements to analyze the detonation structure poses challenges due to the extreme conditions within the detonation engines. Therefore, discussions concerning these topics, as well as other related aspects relevant to detonation, are encouraged. A summary white paper will be published after the conference for the benefit of the technical community.

Goals and objectives:


Topics include, but are not limited to: