• 제목/요약/키워드: Engine Performance Test

검색결과 950건 처리시간 0.034초

가스터빈 엔진 천이 성능 시험에 의한 정상상태 성능 예측

  • 양인영;전용민;김춘택;양수석
    • 항공우주기술
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    • 제2권1호
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    • pp.1-10
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    • 2003
  • 항공기용 가스터빈엔진에 대한 경제적인 시험 기법 개발을 위해 천이상태 성능 시험 결과로부터 정상상태 성능을 예측할 수 있는 방안을 모색했다. 천이상태 성능과 정상상태 성능이 서로 달라지는 현상의 원인을 동역학적 천이 효과, 열적 천이 효과, 공기역학적 천이 효과로 구분하고, 각각을 모델링해서 엔진의 천이상태 성능을 통해 정상상태 성능을 계산하는 보정 인자를 정량화했다. 먼저 천이상태 성능시험 시 나타나는 엔진 입ㆍ출구의 온도 변화가 엔진 성능에 미치는 영향을 보정했고, 그 후 도입된 보정 인자를 사용해 정상상태 성능을 예측했다. 이렇게 예측된 결과와 실제 정상상태 성능시험 결과를 비교한 결과, 연료 소모량의 차이 3.68% 이내로 정상상태 성능을 예측할 수 있었다.

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비행시험을 통한 스마트무인기 엔진 성능 분석 (Performance Analysis of Smart UAV Engine through Flight Tests)

  • 이창호
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2011년도 제37회 추계학술대회논문집
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    • pp.389-392
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    • 2011
  • 본 연구에서는 틸트로터 비행체인 스마트무인기의 비행시험에서 엔진성능 데이터를 추출하고 분석하였다. 비행시험은 프롭로터의 틸트각이 90도에서 0도로 변화하고 다시 0도에서 90도로 변환하는 천이비행 영역에서 이루어졌다. 비행시험으로부터 수집된 엔진성능 데이터로서 엔진 동력과 비연료 소모율은 엔진성능계산프로그램의 예측결과와 잘 일치하였다.

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디젤엔진의 콩기름연료에 의한 운전성능에 관한 시험 (A Study on the Operation Performance of Diesel Engine by using of Soybean Oil Fuel)

  • 이기명
    • 한국농공학회지
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    • 제18권4호
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    • pp.4259-4264
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    • 1976
  • This paper, is about the test on the operating performance of diesel engine by using of soybean oil which farmers could supply in their farm yard. The diesel engine used is a swirl-chamber type, four stroke cycle with single cylinder, air cooling and its rated horse power is 2 PS per 1300 rpm. Several results obtained are as follows; 1. The starting performance of diesel engine with soybean oil is almost the same as that with light oil. 2. The variation of engine speed according to various engine load is small when soybean oil is used compared with light oil. It is considered that soybean oil is desirable for the purpose of industerial power machine fuel. 3. The specific fuel consumption increases approximately 10 percent high in the condition of rated horse power and maximum horse power and shows less or same during the load test in low velocity, when soybean oil is used 4. Though the brake thermal efficiency in the condition of rated horse power and maximum horse power is inclined to decrease when soybean oil is used compared during the load test in low velocityt shows good inclination.

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CRDI시스템을 갖는 천연가스/디젤 혼소차량의 개발에 대한 연구 (Research of Natural Gas/Diesel Dual Fuel Vehicle)

  • 이상민;임옥택
    • 한국자동차공학회논문집
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    • 제20권5호
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    • pp.13-18
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    • 2012
  • This research is about the exhaust gas and driving performance test which are for CNG-Diesel dual fuel engine. The CNG-Diesel dual fuel engine converted from 2500cc diesel has two steps of injection systems; small amount of diesel is injected to mixture CNG in cylinder to ignite before CNG is injected into each intake manifold to form mixture. The amounts of output power and emission in duel fuel consumption were measured by engine dynamometer and exhaust gas analyzer. Over 90% of diesel consumption reduction, similar driving performance to current diesel engine and reduced emission on $CO_2$ and PM, respectively, were indicated through the measurements. The two steps of system were applied to vehicle to investigate exhaust gas characteristics and driving performance via NEDC mode and real driving test. Additional oxidation catalyst was applied to reduce emission on the test vehicle and the NEDC mode test showed the reduction of Co, $CO_2$, Pm and THC.

바이오디젤유를 사용하는 직접분사식 디젤기관의 내구특성 (Durability Test of a Direct Injection Diesel Engine Using Biodiesel Fuel)

  • 유경현;오영택
    • 한국자동차공학회논문집
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    • 제12권1호
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    • pp.32-38
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    • 2004
  • To evaluate the durability of direct injection diesel engine using biodiesel fuel, a small D. I. diesel engine was operated on a blend(BDF 20) of 20% biodiesel fuel and 80% diesel fuel for 200 hours. Engine dynamometer test was performed at a load of 90% and a speed of 1900 rpm to monitor the engine performance and exhaust emissions. Engine performance parameters and exhaust emissions were sampled at 1 hour interval for analysis. The combustion maximum pressure and the crank angle at this maximum pressure as a combustion variation factor were considered to study the combustion characteristics of BDF 20 in diesel engine during durability test. As the results, the standard deviations and errors of combustion variation factors on BDF 20 were very little and combustion characteristics were very stable during the durability test. BDF 20 resulted in lower emissions of carbon monoxide, carbon dioxide, and smoke emissions with special increase of nitrogen oxides compared to diesel fuel. There was no also unusual change in engine oil composition from using BDF 20. Most of engine parts were clean and showed little wear, but soots were detected around the hole of fuel injector when BDF 20 was used in direct injection diesel engine for 200 hours.

흡기포트 선회비 변경에 따른 유동특성 및 엔진성능에 관한 연구 (A Study on the Flow Characteristics and Engine Performance with Swirl Ratio Variance of Intake Port)

  • 윤준규;차경옥
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 춘계학술대회논문집B
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    • pp.899-905
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    • 2000
  • The characteristics of air flow and engine performance with swirl ratio variance of intake port In a turbocharged DI diesel engine was studied in this paper. The intake port flow is important factor which have influence on the engine performance and exhaust emission because the properties in the injected fuel depend on the combustion characteristics. The swirl ratio for ports was modified by hand-working and measured by impulse swirl meter. For the effects on performance and emission, the brake torque and brake specific fuel consumption were measured by engine dynamometer and NOx, smoke were measured by gas analyzer and smoke meter. As a result of steady flow test, when the valve eccentricity ratio are closed to cylinder wall, the flow coefficient and swirl intensity are increased. And as the swirl ratio is increased, the mean flow coefficient is decreasing, whereas the gulf factor is increasing. Also, through engine test its can be expected to meet performance and emission by optimizing the main parameters; the swirl ratio of intake port, injection timing and compression ratio.

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실험계획법과 WAVE 시뮬레이션을 이용한 엔진 작동 변수의 영향도 평가 및 최적화에 대한 연구 (An Application of DoE Methodology in WAVE Simulation to Identify the Effectiveness of Variables on Engine Performance and to Optimize Responses)

  • 정동원;임옥택
    • 한국자동차공학회논문집
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    • 제17권5호
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    • pp.16-25
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    • 2009
  • Testing engine performance using an engine dynamometer requires high technical researchers and many facilities. Nowadays, different variables of CAE program are used for identifying the engine performance instead of engine dynamometer test. This is more convenience, as it does not necessitate an abundance of engine dynamometer experiments and, in addition, produces better results. However, CAE programs also contain various variables which can affect engine performance. Those are coupled with each other, thus making it difficult to determine the effectiveness of different variables on engines. DoE (Design of Experiments) methodology is an efficient way to verify the magnitude of effectiveness on engine performance as well as making responses to be optimized at once without trial & error. This study used data from WAVE simulations, which modeled the DOHC SI engine with in-line 4 cylinders at 1500, 3000 and 4500rpm. DoE methodology is designed properly to determine the effectiveness of five variables on power, BSFC, and volumetric efficiency, as well as to find the optimal response conditions at each rpm through a minimized number of experiments. After finishing DoE process, all the results are examined concerning the reliability of test through a verification experiment.

P8250 학습용 엔진성능의 기초 실험 (Basic Experiment of P8250 Educational Engine Performance)

  • 임창수;최준섭;왕소랑
    • 대한공업교육학회지
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    • 제33권2호
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    • pp.218-231
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    • 2008
  • 본 실험 연구의 목적은 교사교육기관에서 예비 교사들에게 수송기술분야에서 엔진의 기본적인 인자들에 관한 개념 이해를 돕는 데에 있다. 실험엔진으로서 P8250을 사용하여 회전속도를 30~55 rps 범위 내에서 내연기관의 성능의 지배인자인 토크, 제동마력, 연료소비량 등의 기존자료를 구하였고, 이들을 바탕으로 기관의 제동마력과 토크선도로 구성되는 성능곡선을 만들었다. 이 연구에서 얻은 주요 결과를 정리하면 다음과 같다. 첫째, 엔진의 회전속도가 증가함에 따라서 동력 및 제동마력은 선형적으로 증가하고, 중속이상에서는 토크가 감소하였다. 둘째, 토크 및 비 연료 소모량의 변화를 확인할 수 있어 엔진성능의 개념을 이해할 수 있다. 셋째, 엔진성능의 제동마력과 토크의 실험값은 이론값과 유사한 경향을 보였다. 넷째, 회전속도에 따른 공연비는 엔진 회전수가 증가할수록 비례적으로 증가하였다.

디젤기관에서 CNG혼소에 의한 배출가스 저감에 관한 실험적 연구 (An Experimental Study on the Emission Reduction of Duel-Fuel Engine by CNG)

  • 한영출;엄명도;오용석;이성욱
    • 한국자동차공학회논문집
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    • 제5권5호
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    • pp.213-218
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    • 1997
  • CNG dual fuel engine for heavy duty diesel engine has been equipped to a Korean bus engine and tested to compare th engine performance and the emission characteristics with the existing diesel fueled engine. The results are summarized as follows. Diesel fueled engine has the fuel injection timing of BTDC17°. The injection timing of CNG modified engine is retarded to BTDC14° for reduction of NOx. Performance optimization has been carried out to have engine power equivalent to or better than the diesel fueled engine. Smoke is decreased by 85% by Korean smoke 3 mode test. By 6 mode test CO is increased by 313% and THC is increased by 1407%. NOx is decreased by 27%. Even though THC is increased very much, it's not too serious problem since CO and THC emission of diesel engine are very little compared to gasoline engine and THC don't give bad effect on human health. But the reduction technologies of CO and THC need to be considered.

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해성I의 공기흡입식 엔진 성능 검증을 위한 지상시험평가 (The Ground Test and Evaluation to Verify Engine Performance of Sea-Star I)

  • 정재원;김종진;박상우;김상용;김무곤;김태훈
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2009년도 춘계학술대회 논문집
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    • pp.381-384
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    • 2009
  • 해성I에 사용되는 공기흡입식 엔진은 초기 발사추력을 제공하는 부스터가 분리된 후 목표물까지 비행할 수 있는 2차 추진기관이다. 유도탄이 비행을 하는 동안 이동방향 및 고도를 원하는 대로 제어하기 위해서는 체계종합에서의 엔진 성능 검증이 필수적이며, 이를 위해 비행시험 전 지상에서 유도탄체계의 엔진시동시험을 수행하여야 한다. 본 논문은 해성I에 사용되는 공기흡입식 엔진의 성능검증을 위한 지상 시험, 평가 방법을 제시한다.

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