A new approach for optimum selection of a turbocharger using a genetic algorithm

Abstract

A new method of selecting an optimum turbocharger for a specific engine using thermodynamic and turbomachinery analyses is presented in this paper. The optimum turbocharger was selected for enhancing the power output of the engine by minimizing an objective function (the sum of the compressor losses and the turbine losses). Constraints in the optimization process were used to locate the operating points of the turbocharged engine at the appropriate position on the compressor map (with a sufficiently large distance from the surge line and the choke line) as well as to satisfy a few parameter values. The design parameters in the optimization procedure were the geometric and aerodynamic parameters of the compressor and the turbine. The proposed method was used to specify the geometry of an optimum turbocharger for an engine (the OM 457 LA diesel engine in our case study) or to select a turbocharger from the vendor list. On applying the above procedure for selecting a turbocharger, the compressor efficiency of the selected turbocharger at various engine speeds was between 0.67 and 0.76, the turbine efficiency was between 0.68 and 0.74, and the index for the appropriate distance from the surge line and the choke line on the compressor map was between 0.2 and 0.72.

An approach to select an appropriate turbocharger for matching with an internal combustion engine

“…Contrarily to DBs created by Sanaye et al 14 and Emara et al 41 the actual one contains around 500 different types of TCs obtained from several manufacturers' open sources [42][43][44] and covering a large mass flow and pressure ratio ranges; from 0.041 to 1.46 kg, and from 0.26 to 3.74, respectively. The main difficulties encountered during the DB construction were due to the lack of information.…”

“…The principal objective of TC matching is to maintain the engine operates far from surge and choke lines of the CC's map. To reach these objectives, several works tried to redesign or to propose a new design of TC compressor to enhance the engine output power, 9,10 improve mechanical sustainability, 11,12 secure working of the CC (surge margin), [13][14][15][16] or to optimize the design procedure. 17,18 Some researches were focused on the components of the TC or ICE including inlet and exhaust manifolds, 19 intercooler, 20,21 the CC and RIT casings, 22,23 variable turbine geometry, 24 exhaust gas recirculation, 25,26 or twin-entry radial turbine.…”

“…[36][37][38] The main advantage of these methods is their rapidity and flexibility which allow several investigations impossible to carry out experimentally. For this type of approach, Sanaye et al 14,37 proposed a new method where the compressor and turbine parts besides the engine were analyzed and optimized, the optimum selected TC had the minimum compressor and turbine losses. Moreover, the operating points of the TCed engine had sufficiently large distances from surge and choke lines.…”