Plenary Talk

Prof. Cameron Tropea

TU Darmstadt, Germany

Optical Measurement of Drops in Flows

Prof. Mahesh Panchagnula

Professor, Department of Applied Mechanics, Indian Institute of Technology Madras

Discovering spatiotemporal structure of sprays through applying tools of data science

Abstract: Data Science techniques have helped develop deep insights into several physical phenomena. Sprays cannot be an exception since the experimental tools that are in common use on sprays are ‘big data’ generators. We will first (briefly) discuss the set of data science tools available to fluid mechanicians with examples of their applications to sprays. We will then discuss the application of time series analysis tools towards developing insights into PDPA data. From the PDPA data analysis of air-blast and pressure swirl sprays, we will show that every single point data contains information of the class of atomizer from where the sprays originated. We will also show that it is possible to produce a data-science driven synthetic drop injection model that will preserve the microstructure of the spray, for use in CFD simulations. Finally, we will discuss the exciting directions that are being revealed in applying data science and machine learning models to spray data.

Prof. Sungwook Park

School of Mechanical Engineering, Hanyang University, Seoul, Republic of Korea

Visualization of in-cylinder flow and mixture formation using an optically accessible DISI engine

Brief bio: Professor Park’s research interests include internal combustion engines and sprays. A major research focus of his work has been developing and applying advanced combustion strategies like RCCI and Low CAI. Park’s engine experiments used fully instrumented single-cylinder research engines equipped with high-pressure fuel injection systems. The experimental results are used to study the effect of fuel injection characteristics on engine performance. He received his Ph.D. degree from Hanyang University in 2005. Before joining the Hanyang university in 2009, he spent three years at the Engine Research Center, University of Wisconsin-Madison.

Abstract: This paper presents an experimental and numerical study on the in-cylinder flow and mixture formation process of an optically accessible direct injection spark ignition engine equipped with a center-mounted injector. A novel optical engine was designed for full access to the combustion chamber by using a quartz liner and oiless system. The cross-correlation PIV method was used to visualize the in-cylinder flow quantitatively and the spray development processes were visualized using the high-speed camera. In addition, CFD simulations using the CONVERGE were performed to analyze the experimental results. We swept the engine operating parameters to understand their effects on the in-cylinder flow development.

Prof. Norihiko Iki

The National Institute of Advanced Industrial Science and Technology (AIST)

Development of Ammonia Combustion and Hydrogen Energy Technologies for a Decarbonized Society

Abstract: As with global decarbonization efforts Japan research and development is underway to achieve carbon neutrality. In the Sixth Strategic Energy Plan, the key theme is to show the path of the energy policy to realize carbon neutrality by 2050 and reduce greenhouse gas emissions by 46% in FY 2030 from its FY 2013 levels. 1% Hydrogen/ammonia will be positioned in power generation mix in FY2030. The Government of Japan has begun demonstrating the supply chain of various hydrogen carriers, and liquid hydrogen, MCH, and ammonia projects are underway. Fukushima Renewable Energy Institute, AIST (FREA) works on hydrogen energy technologies, especially R&D of hydrogen carriers including ammonia fuel. Ammonia is liquified gas similar to LPG and no carbon fuel, so it is expected as an alternative fuel to fossil fuels. FREA tries ammonia gas combustion and ammonia spray combustion for gas turbine engine, etc.

Prof. Kuo-Long Pan

Mechanical Engineering, National Taiwan University, Taiwan

Droplet combustion of multi-component biofuels doped with nanoparticles.

Abstract: Single droplet burning could be treated as a unit that is key to understanding the fundamental features of spray combustion in liquid-fueled engines. Moreover, in the environment of reduced gravity, the configuration of spherical symmetry has been adopted as a paradigm to reveal the essential behaviors of droplet combustion. By means of a small drop tower built in our lab, together with a technique allowing for free-falling droplets, we have investigated the combustion of droplets made of various biofuels and mixtures, even doped with nanoparticles. Different modes of disruptions including microexplosions have been studied, demonstrating specific ways toward or against the occurrence. Comprehension of the roots would pave a route to various applications underlying the combustion in complex geometries of engines.

Prof. Qing-Fei Fu

School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing, China

Brief bio: Fu Qingfei, born in January 1983, is now a professor of Beihang University, China. His main research interests include the atomization mechanism of liquid rocket engine propellant, injector dynamics and combustion instability. He has published more than 70 SCI index papers, has 13 patents authorized, and published a textbook and a monograph. The research results are applied to metallurgical, electric power, petrochemical and other industrial fields. In 2021, he won the best young researcher award of ILASS International, ” Hiroyasu Award “.

Abstract: Unsteady atomization is a common phenomenon in the liquid rocket engines, especially when the combustion instability occurs. Understanding the process, characteristics and mechanism of unsteady atomization is critical to understanding the role of atomization in unstable combustion. This presentation describes the research progress of unsteady atomization in recent years. We divides the unsteady atomization into two kinds of problems: injector dynamics caused by pulsation of incoming supply pressure, and liquid injection in the standing wave sound field downstream of the injector plate. It focuses on the transfer relationship between the pulsating pressure and flow rate of the nozzle, as well as the effects of the sound field strength, the position of injector in the sound field on the atomization.