Newsletter  2022.2  Index

Theme :"The Conference of Fluid Engineering Division (February issue)" Preface （T. Hashimoto，S. Matsuda，H.J. Park） Glimpses of Jomon lifestyle from interdisciplinary research Nobuhiko KAMIJO (Hirosaki University) Stress of needle-free injection by focused microjet and study on stability of the jet velocity using machine learning Daichi IGARASHI, Yuta Miyazaki, Masashi USAWA, Shuma KAWAI, Jingzu YEE, Masakazu MUTO, Shoto SEKIGUCHI, Yoshiyuki TAGAWA (Tokyo University of Agriculture and Technology) Numerical Simulation on Nano Fibril Orientational Control by Electric Field in Cellulose Dispersed Flow Takumi USUI (Tohoku University), Hidemasa TAKANA (Tohoku University) Evaluation of Particle Behavior in Radial Turbine for Marine Turbocharger Based on Lagrangian Particle Tracking Model Nao TANIGUCHI, Fumito HIRATANI (MITSUBISHI HEAVY INDUSTRIES, LTD.), Takeshi TSUJI and Hidetaka NISHIMURA (Mitsubishi Heavy Industries Marine Machinery & Equipment, Ltd.) Diary of Flow Sommelier and Sound Sommelier Mari Kasai (Hokkaido University)

 

Evaluation of Particle Behavior in Radial Turbine for Marine Turbocharger Based on Lagrangian Particle Tracking Model

Nao TANIGUCHI (MITSUBISHI HEAVY INDUSTRIES, LTD.)	Fumito HIRATANI (MITSUBISHI HEAVY INDUSTRIES, LTD.)	Takeshi TSUJI (Mitsubishi Heavy Industries Marine Machinery & Equipment, Ltd.)	Hidetaka NISHIMURA (Mitsubishi Heavy Industries Marine Machinery & Equipment, Ltd.)

Abstract

In the radial turbine used for marine turbocharger, the collision of combustion residue particle contained in engine exhaust gas causes turbine blades erosion. In this environment, turbine blade may be damaged that lead to increased maintenance costs and decreased turbocharger efficiency. However, there are many unclear points in the flow mechanism, which has difficulty to design turbine blade from a viewpoint of particle behaviour.

In this study, we evaluate the particle behaviour in the radial turbine based on lagrangian particle tracking Model. After gas analysis, 400,000 particles were flowed at the same initial velocity as gas to carry out one-way particle analysis. In order to make a quantitative evaluation, we split the turbine blade surface in detail to calculate the particle adhesion rate.

As a result, at the leading edge of the turbine blade, the impact of particles with large inertia which are difficult to follow the air flow was found to be the cause of erosion. In addition, the main particle size reaches to the turbine blade suction surface leading edge had good agreement with the real turbine impact marks. Accordingly, the possibility of explaining the turbine erosion phenomenon by the particle adhesion rate of each part was obtained. These results confirmed that turbine design including particle behaviour is possible. Furthermore, we got that particle behaviour mechanism in the radial turbine does not change by turbine blade phase angle.

 Ships are essential for economic activity, marine turbocharger is required reliability as well as high efficiency for fuel consumption reduction. We will continue to develop marine turbocharger using analysis technology to improve its functions and conserve resources.

Key words

Radial Turbine, Erosion, CFD, Particle Tracking, One way coupling

Figures

Figure 1  Overview of turbocharger.

Figure 2  Example of impact marks on turbine surface due to combustion residue particles.

Figure 3  Particle adhesion rate and particle trajectory on blade suction surface L.E.

Figure 4  Particle flow mechanism in turbine blade.