The flow characteristic of exhaust system has an important impact on inlet boundary of the turbine. In this paper, high speed flow\nin a diesel exhaust manifold junction was tested and simulated. The pressure loss coefficient of the junction flow was analyzed. The\nsteady experimental results indicated that both of static pressure loss coefficients L13 and L23 first increased and then decreased\nwith the increase of mass flow ratio of lateral branch and public manifold. The total pressure loss coefficient K13 always increased\nwith the increase of mass flow ratio of junctions 1 and 3. The total pressure loss coefficient K23 first increased and then decreased\nwith the increase of mass flow ratio of junctions 2 and 3. These pressure loss coefficients of the exhaust pipe junctions can be used in\nexhaust flow and turbine inlet boundary conditions analysis. In addition, simulating calculation was conducted to analyze the effect\nof branch angle on total pressure loss coefficient. According to the calculation results, total pressure loss coefficient was almost the\nsame at lowmass flow rate of branchmanifold 1 but increased with lateral branch angle at highmass flow rate of branchmanifold 1.
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