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GMT公司在缸径较大的A420和BL550型烧重油的中速柴油机的基础上,综合当今发展趋势,设计了缸径为320mm的A320系列烧重油的中速柴油机。耐久试验表明,A320能用重油可靠运行。6缸样机在720r/min的转速下已运转700小时。试验以12小时为一循环周期,其中2小时在25％负荷下运转,8小时在满负荷下工作,1小时在110％的负荷下作超负荷运转。满负荷时的功率为368kW/缸,超负荷功率为404kW/缸。第2组试验为500小时,在405kW/缸的功率下运转,并用800～1720cSt的重油工作。试验证实A320用重油工作是可靠的,尽管发动机和涡轮增压器在起动和低负荷下作反复的变工况循环试验,积焦状况在可接受的范围内,热应力很小,磨损和腐蚀可忽略不计,活塞环清洁,连杆曲柄销轴承和主轴承情况良好。据此,GMT公司给出了A320机预期的大修间隔和使用寿命(见表)。 A320柴油机能燃用CIMAC12或ISO RMH55
Based on the medium-speed diesel engines with larger bore sizes A420 and BL550, GMT has designed A320 series heavy-duty medium-speed diesel engines with 320mm bore diameter based on the current development trend. Durability tests show that the A320 can run reliably with heavy oil. The 6-cylinder prototype has been running for 700 hours at 720 r / min. The test was performed on a 12-hour cycle with 2 hours at 25% load, 8 hours at full load and 1 hour at 110% load. The power at full load is 368kW / cylinder, and the overload power is 404kW / cylinder. The second group was tested for 500 hours at a power of 405 kW / cylinder and operated with heavy oil of 800 to 1720 cSt. The tests confirm that the A320 is reliable with heavy oil, although the engine and turbocharger are subjected to repeated variable cycle tests at start-up and at light loads, the coke condition is within acceptable limits with little thermal stress, wear and corrosion Negligible, clean piston rings, connecting rod crankpin bearings and main bearings in good condition. As a result, GMT provided the expected overhaul intervals and service life of the A320 (see table). The A320 diesel engine can burn CIMAC12 or ISO RMH55