Study On Sail Performance And Engine-Propeller Matching Of Large Ocean-going Bulk Carrier

It is predicted that the consumption will be around350million tons ayear by2020. With demand for fuel increasing people pay more and moreconcentration on green housing gas. Thus, it’s necessary to limit themassive fuel consumption and GHG emission.As wind power developed well, technology of wind utilization onsmall vessel has been mature. Sail-assisted technology on large vessel isrelatively less developed while the global fleet which has70000commercial ships consumes approximately200million tons of diesel fuela year. Depth study is much necessary. In this paper current sail-assistedvessel and airfoils and their aerodynamic characteristics were researchedsystematically. The aerodynamic characteristics of designed sail werenumerically calculated with CFD. Based on the former work, bulk carrierwas selected and the engine-propeller-sail matching map was completely.In the first section, this paper studied on the existing sail-assistedvessels and airfoil types. Based on these systematic research sail programwas designed for large ocean-going bulk carrier. With software CFDairfoil of designed sail was modeled and flow field around it wassimulated and calculated. Finally the thrust coefficients and lateral forcecoefficients were calculated out to provide reference for next work.In the second section, this paper introduced the domestic and foreignspecifications for sail-assisted vessel stability checking. Based on theanalysis and comparison of different norms this paper gave the proposedspecification and calculation method for large ocean-going bulk carrierwith sail-assisted propulsion.In the third section, this paper chose the fixed sailing speed mode,constant pitch aircrew and directly transmission mode for the sail-assistedvessel operation features. Engine-propeller-sail matching wascompromised and calculated in this paper. The matching map wasobtained for sailing operation. Finally this paper gave series of operation and management advices for sail-assisted propulsion control andmanagement.In the last section, the turbo charger diesel engine was simulated toobtain the propulsion characteristics under series loads. With the effectivefuel consumption rates a sum of fuel consumption of sail-assisted ship canbe calculated. With these simulation results the detailed oil saving can bepredicted.