{'fraction_non_alphanumeric': 0.013004791238877482, 'fraction_numerical': 0.0054757015742642025, 'mean_word_length': 5.412280701754386, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Numerical Investigation on Effect of Inlet Dump Angle on Ramjet Combustor Performance

Ramjet combustion is a highly complex phenomenon involving simultaneous momentum, heat and mass transport processes. It involves a variety of complexities such as high temperature variation, intricate flame chemistry and liquid – gas phase coupling, which are formidably challenging for a complete theoretical analysis. The governing equations with appropriate boundary conditions for flow in a ramjet dump combustor with two side inlets 90 apart are solved using the flow simulation software FLUENT. Standard k H equations based on generalized Boussinesq eddy viscosity concept are employed for the prediction of turbulent flow features. The gas phase heat and mass transfer have been modelled by Eulerian approach, while Lagrangian formulation is used for tracking the fuel particles. In liquid phase modelling, the momentum, energy and species balances are carried out by treating the droplet as a lumped system. Probability Density Function (PDF) approach is employed to describe the turbulent fluctuations in the mixture fraction. Predictions of temperature inside a ramjet combustor were compared with the limited experimental data available and these were found to match reasonably well. A detailed study has been carried out on the baseline combustor geometry under consideration for air inlet dump angles of 30,45 and 60 and the results are discussed in this paper.