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Benchmarking of Improved DPAC Transient Deflagration Analysis Code

[+] Author and Article Information
James E. Laurinat

Savannah River National Laboratory, Savannah River Site, Aiken, SC 29808
james.laurinat@srnl.doe.gov

Steve J. Hensel

ASME Fellow, Savannah River Nuclear Solutions, Savannah River Site, Aiken, SC 29808
steve.hensel@srnl.doe.gov

1Corresponding author.

ASME doi:10.1115/1.4037635 History: Received December 06, 2016; Revised August 07, 2017

Abstract

The transient deflagration code DPAC (Deflagration Pressure Analysis Code) has been upgraded for use in modeling hydrogen deflagration transients. The upgraded code is benchmarked using data from vented hydrogen deflagration tests conducted at the HYDRO-SC Test Facility at the University of Pisa. DPAC originally was written to calculate peak deflagration pressures for deflagrations in radioactive waste storage tanks and process facilities at the Savannah River Site. Upgrades include the addition of a laminar flame speed correlation for hydrogen deflagrations and a mechanistic model for turbulent flame propagation, incorporation of inertial effects during venting, and inclusion of the effect of water vapor condensation on vessel walls. In addition, DPAC has been coupled with CEA, a NASA combustion chemistry code. The deflagration tests are modeled as end-to-end deflagrations. The improved DPAC code successfully predicts both the peak pressures during the deflagration tests and the times at which the pressure peaks.

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