Modern wheeled armoured vehicles are constructed as multipurpose. Universal construction of vehicle is achieved in two separate ways: as specialized versions of vase model or by using exchangeable mission-modules. Realization of various tasks requires different equipment; ensure adequate level of protection and firepower. Increase of protection level, implementation of weapon systems, characterized by high firepower despite technological advancement in this field affect vehicles weight increase and therefore, it also affects requirements for other vehicle systems. Ensuring high mobility requires use of high power, turbocharged diesel engines, hydro mechanical transmission, hydro pneumatics suspension, possibility of clearance adjustment, use of central wheel pumping system enabling tire pressure change according to the surface on witch vehicle runs. This study gathers and compares characteristics of selected wheeled armoured personnel carriers and determines possible directions of development for future wheeled vehicles.
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Current trends in the high bypass ratio turbofan engines development are discussed in the beginning of the paper. Based on this, the state of the art in the contemporary turbofan engines is presented and their change in the last decade is briefly summarized. The main scope of the work is the bypass ratio growth analysis. It is discussed for classical turbofan engine scheme. The next step is presentation of reach this goal by application of an additional combustor located between high and low pressure turbines. The numerical model for fast analysis of bypass ratio grows for both engine kinds are presented. Based on it, the numerical simulation of bypass engine increasing is studied. The assumption to carry out this study is a common core engine. For classical turbofan engine bypass ratio grow is compensated by fan pressure ratio reduction. For inter turbine burner turbofan, bypass grown is compensated by additional energy input into the additional combustor. Presented results are plotted and discussed. The main conclusion is drawing that energy input in to the turbofan aero engine should grow when bypass ratio is growing otherwise the energy should be saved by other engine elements (here fan pressure ratio is decreasing). Presented solution of additional energy input in inter turbine burner allow to eliminate this problem. In studied aspect, this solution not allows to improve engine performance. Specific thrust of such engine grows with bypass ratio rise – this is positive, but specific fuel consumption rise too. Classical turbofan reaches lower specific thrust for higher bypass ratio but its specific fuel consumption is lower too. Specific fuel consumption decreasing is one of the goal set for future aero-engines improvements.
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