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Medientyp:
E-Book
Titel:
An Integrated Cfd-Aided Analytical Method for Braking and Thermal Characteristics of Mechanical-Electro-Liquid Hydrodynamic Auxiliary Braking Systems
Beschreibung:
A newly-developed auxiliary braking system has been designed that integrates the heat exchange capability of a hydrodynamic retarder and the rapid response of a hybrid control system. However, developing a mathematic method for predicting the coupling relationship between control information and energy transform has been a significant challenge in design. The present study thus establishes an integrated CFD-aided solution method for numerically analyzing the interaction between the control characteristics, braking generation, and flow and thermal fields. The solution method is based on a 1D/3D co-simulation model and multi-physics coupling model, including a multi-domains coupling CFD transients calculation, bond-graph method, and collaborative calculation control block in multi-time-step. It can be applied to actively realize the braking and thermal properties that changes dynamically with the control signal, and the numerical findings matched the experimental results well. The energy exchange mechanism for multi-physics coupling is analyzed, and the action of the blade agitation and centrifugal force in the development of gas-liquid phases for multi-domains is found to affect the oil-filling control and braking generation. Consequently, increasing the control pressure (Pair) and decreasing the outlet throttle area (Aout) are beneficial in enhancing braking torque, shortening response time, and improving heat exchange efficiency. Thermodynamically and dynamically analyses verify that the braking and control properties could be adjusted safely and reliably under the design conditions of Pair ≤ 3.2bar and Aout ≥ 64πmm2. The proposed solution method can be applied to reduce design costs and guide the design and development of braking strategies and thermal managements