自然循環並列蒸発管における流れ振動解析のためのシミュレーションモデル

概要

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We developed an analytical model to investigate nonlinear characteristics of flow oscillation in parallel evaporating tubes in natural circulation boilers. The evaporating tubes are connected with an inlet header and an outlet drum, and consist a natural circulation loop with an unheated downcomer tube. We started from conservation laws of mass, momentum and thermal energy of incompressible single-phase and homogeneous two-phase flow, and obtained a lumped-parameter model subdividing the single-phase and two-phase regions of the evaporator and the riser, taking account of movement of the boiling boundary. The resulting numerical model is an ordinary differential equation systems with nonlinear coefficients, and can be solved with Gauss elimination and Runge-Kutta method. We also gave an exact expression of characteristic equation of the linearized systems.
香川高等専門学校の論文