The supercritical water mixing phenomenon is investigated with a wide range of conditions, i.e. the inlet temperature of the streams ranges from 323.15K to 723.15K and the pressure ranges from 25MPa to 45MPa. A sensitivity study is carried out for the jet and main flow velocity ratio (VR) which is varying from 1 to 40. In addition, the effect of the inject angles of branch flow to main flow on the mixing is conducted by varying the inject angle from 80° to 100°. The results show that the maximum temperature gradient appears on the wall of the upstream side in all the cases, and the inclined angles can be optimized to mitigate the thermal stress.
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