Selection Of Turbochargers On Dynamic Main Engine Operating Conditions

Setiap tipe turbocharger memiliki perbedaan efisiensi, karena turbocharger sangat dipengaruhi oleh nilai volumetric flow rate dan compression ratio yang berubah-ubah tergantung pada kondisi kinerja mesin. Terutama pada dynamic main engine operating conditions, perubahan kecepatan kapal mempengaruhi proses termodinamika pada ruang bakar mesin. Nilai compression ratio dan suplai temperatur udara bergantung pada prosesnya. MV. Meratus Palembang sebagai kapal kontainer bekerja pada “dynamic main engine operating conditions” untuk mengantarkan muatan secara tepat waktu. Berdasarkan Grinevetsky Mazing Method, proses termodinamika dapat dihitung menjadi empat bagian utama; charging, compression, combustion, dan expansion. Metode ini dipergunakan untuk mendapatkan nilai turbocharger operating line, turbocharger efficiency, dan engine power output dimana nilai-nilai tersebut merupakan parameter dari turbo-engine matching. Efek pembebanan mempengaruhi nilai volumetric flow rate 3,15 m3/s untuk VTR 304, untuk VTR 321 2,5 m3/s, dan untuk VTR 354 juga pada 3,15 m3/s. Hal ini terjadi karena mesin diberi beban yang tinggi oleh propeller yang akan mempengaruhi kinerja turbocharger untuk meberikan energi lebih. Sehingga pada dynamic main engine operating conditions membuat nilai volumetric flow rate semakin meningkat. Selain itu pada VTR 304 di kecepatan kapal 11,1 knot turbocharger memiliki efisiensi sebesar 80%, dan keceptan dinas (Vs) di 10,4 knot turbocharger memiliki efisiensi sebesar 78%, pada VTR 321 di kecepatan 11,1 knot turbocharger memiliki efisiensi sebesar 78% dan pada keceptan dinas (Vs) di 10,4 knot turbocharger memiliki efisiensi sebesar 80%, pada VTR 354 di keceptan 11,1 knot turbocharger bekerja secara surging dan kecepatan dinas(Vs) pada 10,4 Knot turbocharger juga bekerja secara surging. Daya mesin pada kondisi beban maksimum untuk VTR 304 menjadi 3220.595 kW, untuk VTR 321 menjadi 2588.903 kW, dan untuk VTR 354 menjadi 3220.595 kW. =================================================================== Every turbocharger has differences efficiency of its working area, it has to be considered seriously because in every volumetric flow rate and pressure ratio turbocharger has different efficiency. Moreover in dynamic main engine operating conditions the various speed of ship is influencing the process of thermodynamics in main engine combustion chamber. The value of pressure ratio and temperature of air supply is relying to its process. MV. Meratus Palembang as a container ship has a dynamic main engine operating conditions to deliver its cargo on time. Based on Grinevetsky Mazing Method, thermodynamics process can be calculated into four main steps; charging, compression, combustion, and expansion. The approach are used to obtain the value of turbocharger operating line, turbocharger efficiency, and engine power output which are the parameter for turbo-engine matching. In the engine-propeller load, at maximum pressure ratio of turbocharger have a volumetric flow rate at 3,15 m3/s for VTR 304, for VTR 321 at 2,5 m3/s, and for VTR 354 also at 3,15 m3/s. These things happen because propeller given a high loads to the engine which affecting turbocharger to support more energy than the engine normal load. So the dynamic main engine operating conditions make the volumetric value increasing. Moreover on VTR 304 at 11,1 knots turbocharger has an efficiency at 80%, and for design speed of ship (Vs) at 10,4 knots turbocharger has an efficiency at 78%, on VTR 321 at 11,1 knots turbocharger has an efficiency at 78 % and for design speed of ship (Vs) at 10,4 knots turbocharger have an efficiency at 80%, on VTR 354 at 11,1 knots turbocharger is surging and for design speed of ship (Vs) at 10,4 knots turbocharger have a surge efficiency also. Engine power output at maximum load condition for VTR 304 the power output become 3220,595 kW, for VTR 321 become 2588,903 kW, and for VTR 354 become 3220,595 kW