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The effect of water spray and mist on the hydrogen-air explosion
With the world shifting to greener energy, hydrogen has received more traction than any other alternative fuel in the last decade. With it comes the risk of hydrogen-air explosion. The effects of water mist in explosion energy absorption are not novel. Various study on the use of water mist for the hydrogen-air explosion has been done. This thesis proposes simple models for droplet evaporation and droplet acceleration under explosion conditions. The models were developed by analyzing various correlations developed so far by other authors, and simplifying the correlations further with elementary assumptions. The models were simulated in python. Models are based on fundamental equations, making them simple for readers. As part of the thesis objective, a mixing chamber was designed and prototyped for hydrogen-air-mist mixture and tests were done. Furthermore, to understand the interaction between hydrogen-air-mist, the droplet exiting the nozzle was studied. This was done by LASER technique imaging and image processing in ImageJ. The data were further processed to get a trend. It is seen that the droplet diameter changes with exit pipe length. The model, upon simulation, gave existing trends, generated by already existing models, denoting the feasibility of the model. The prototype also performed its function while exhibiting margin for significant design improvements.
The effect of water spray and mist on the hydrogen-air explosion
With the world shifting to greener energy, hydrogen has received more traction than any other alternative fuel in the last decade. With it comes the risk of hydrogen-air explosion. The effects of water mist in explosion energy absorption are not novel. Various study on the use of water mist for the hydrogen-air explosion has been done. This thesis proposes simple models for droplet evaporation and droplet acceleration under explosion conditions. The models were developed by analyzing various correlations developed so far by other authors, and simplifying the correlations further with elementary assumptions. The models were simulated in python. Models are based on fundamental equations, making them simple for readers. As part of the thesis objective, a mixing chamber was designed and prototyped for hydrogen-air-mist mixture and tests were done. Furthermore, to understand the interaction between hydrogen-air-mist, the droplet exiting the nozzle was studied. This was done by LASER technique imaging and image processing in ImageJ. The data were further processed to get a trend. It is seen that the droplet diameter changes with exit pipe length. The model, upon simulation, gave existing trends, generated by already existing models, denoting the feasibility of the model. The prototype also performed its function while exhibiting margin for significant design improvements.
The effect of water spray and mist on the hydrogen-air explosion
Thapa, Suraj (Autor:in) / Bjerketvedt, Dag / Lundberg, Joachim
01.01.2022
Hochschulschrift
Elektronische Ressource
Englisch
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