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Evaluating Primary Blast Effects In Vitro

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Published on: September 18, 2017

A second-generation constrained reaction volume shock tube.

M F Campbell¹, A M Tulgestke¹, D F Davidson¹

¹Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA.

The Review of Scientific Instruments

|June 2, 2014

Summary

A novel shock tube design with a sliding gate valve creates near-constant-pressure conditions for combustion experiments. This Constrained Reaction Volume (CRV) technique improves reactive flow field modeling and enables accurate ignition delay time measurements.

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Area of Science:

* Combustion Science
* Chemical Engineering
* Fluid Dynamics

Background:

* Traditional shock tubes often struggle with pressure fluctuations behind reflected shocks.
* Accurately modeling reactive flow fields requires stable, well-defined experimental conditions.
* Previous methods for controlling test gas environments in shock tubes had limitations.

Purpose of the Study:

* To introduce a second-generation Constrained Reaction Volume (CRV) shock tube.
* To enable near-constant-pressure conditions for reactive experiments behind reflected shocks.
* To improve the accuracy of reactive flow field modeling.

Main Methods:

* Development of a shock tube incorporating a sliding gate valve.
* Mechanical separation of reactive test gas from a non-reactive buffer gas.
* Tailoring of buffer gas mixtures and analysis of gas interactions upon valve opening.

Main Results:

* The CRV strategy successfully achieved near-constant-pressure conditions.
* Demonstrated the capability to study a range of fuel types.
* Presented example low-temperature ignition delay time data validating the system's performance.

Conclusions:

* The new CRV shock tube design provides improved test conditions for combustion research.
* This technique enhances the ability to model complex reactive flow fields.
* The system is suitable for a variety of fuel studies, particularly low-temperature ignition.