PFI PDPA 예비레포트

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1. PFI (Port Fuel Injection)

PFI(Port Fuel Injection)는 연료를 실린더 내부로 직접 분사하는 GDI(Gasoline Direct Injection)와 달리 연료를 흡기 포트에 분사하는 방식입니다. PFI는 GDI에 비해 연료 분사 압력이 낮고 연료 분사 타이밍이 늦어 상대적으로 연소 효율이 낮지만, 제작 비용이 저렴하고 배기 가스 배출이 깨끗한 장점이 있습니다.
2. PDPA (Phase Doppler Particle Analyzer)

PDPA(Phase Doppler Particle Analyzer)는 레이저 도플러 속도계(LDV)를 기반으로 하는 입자 크기 및 속도 측정 장치입니다. 두 개의 레이저 빔이 교차하여 생성된 간섭 무늬를 통해 입자의 크기와 속도를 동시에 측정할 수 있습니다. PDPA는 연료 분사 시스템, 분무, 연소 등의 연구에 널리 사용됩니다.
3. GDI (Gasoline Direct Injection)

GDI(Gasoline Direct Injection)는 연료를 실린더 내부로 직접 분사하는 방식으로, PFI(Port Fuel Injection)에 비해 연료 분사 압력이 높고 연료 분사 타이밍이 빨라 연소 효율이 높습니다. 하지만 제작 비용이 높고 배기 가스 배출이 상대적으로 많은 단점이 있습니다.
4. MPI (Multi Point Injection)

MPI(Multi Point Injection)는 각 실린더마다 연료 분사기가 설치되어 있어 연료 분사 제어가 정밀하고 연비 향상 효과가 있습니다. 하지만 PFI에 비해 제작 비용이 높은 단점이 있습니다.
5. Sauter Mean Diameter (SMD)

Sauter Mean Diameter(SMD)는 분무 입자의 크기 분포를 나타내는 대표 지표로, 분무 특성을 평가하는 데 사용됩니다. SMD는 분무 입자의 표면적과 부피의 비율을 나타내며, 연료 분사 시스템 및 연소 특성 분석에 활용됩니다.

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1. PFI (Port Fuel Injection)

PFI (Port Fuel Injection) is a fuel injection system used in internal combustion engines, where the fuel is injected into the intake port of each cylinder, rather than directly into the combustion chamber. This system has several advantages, including improved fuel atomization, better air-fuel mixture preparation, and reduced emissions. PFI systems are relatively simple and cost-effective, making them a popular choice for many automotive applications. However, they may not be as efficient as more advanced fuel injection systems, such as GDI (Gasoline Direct Injection), in terms of fuel economy and power output. Overall, PFI remains a reliable and widely-used fuel injection technology in the automotive industry.
2. PDPA (Phase Doppler Particle Analyzer)

PDPA (Phase Doppler Particle Analyzer) is a non-intrusive optical measurement technique used to characterize the size and velocity of particles in a flow. This technology is particularly useful in applications such as spray and aerosol research, where understanding the behavior of droplets or particles is crucial for optimizing processes and improving efficiency. The PDPA system uses the Doppler effect to measure the velocity of particles, while the phase shift between the scattered light signals is used to determine the particle size. This technique provides highly accurate and detailed information about the particle size distribution and flow dynamics, making it an invaluable tool for researchers and engineers working in various fields, including combustion, pharmaceutical, and environmental engineering. The PDPA's ability to provide real-time, in-situ measurements without disturbing the flow makes it a powerful and versatile diagnostic tool.
3. GDI (Gasoline Direct Injection)

GDI (Gasoline Direct Injection) is a fuel injection technology that has gained significant popularity in the automotive industry in recent years. In a GDI system, the fuel is directly injected into the combustion chamber, rather than the intake port as in a traditional port fuel injection (PFI) system. This approach offers several advantages, including improved fuel efficiency, increased power output, and reduced emissions. By directly injecting the fuel into the cylinder, GDI systems can achieve a more precise control over the air-fuel mixture, leading to better combustion and reduced fuel consumption. Additionally, the high-pressure injection and precise timing of the fuel delivery in GDI engines can result in a more complete combustion, further enhancing efficiency and reducing emissions. While GDI systems are more complex and costly compared to PFI, the benefits they provide in terms of performance and environmental impact have made them a preferred choice for many modern gasoline-powered vehicles.
4. MPI (Multi Point Injection)

MPI (Multi Point Injection) is a fuel injection system used in internal combustion engines, where the fuel is injected into the intake port of each cylinder through multiple injectors. This approach offers several advantages over single-point injection systems, such as improved fuel atomization, better air-fuel mixture preparation, and more precise control over the fuel delivery. By having individual injectors for each cylinder, MPI systems can tailor the fuel injection to the specific needs of each cylinder, leading to more efficient combustion and reduced emissions. Additionally, the use of multiple injectors can improve the engine's response and performance, as the fuel can be delivered more quickly and accurately. While MPI systems are more complex and costly than simpler fuel injection technologies, such as carburetor or single-point injection, the benefits they provide in terms of fuel efficiency, power output, and emissions control have made them a widely-adopted solution in modern gasoline-powered engines.
5. Sauter Mean Diameter (SMD)

Sauter Mean Diameter (SMD) is a key parameter used to characterize the size distribution of droplets or particles in a spray or aerosol. It represents the diameter of a droplet that has the same surface-to-volume ratio as the entire spray or particle cloud. The SMD is an important metric in various applications, such as combustion, fuel injection, and pharmaceutical drug delivery, where the size and distribution of the dispersed phase (e.g., fuel droplets, drug particles) can significantly impact the efficiency, performance, and effectiveness of the system. A smaller SMD generally indicates a finer atomization or dispersion, which can lead to improved mixing, faster evaporation, and more efficient combustion or drug delivery. The ability to accurately measure and control the SMD is crucial for optimizing the design and operation of these systems, as it allows engineers and researchers to better understand the underlying physical processes and make informed decisions to improve overall performance and efficiency.