Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 53, Issue 1 (2019) 69-74 69 Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Journal homepage: www.akademiabaru.com/arfmts.html ISSN: 2289-7879 Effect of Acoustic Excitation toward Jet Flame: An Experimental Design Azwan Sapit 1 , Mohd Azahari Razali 1, , Mohd Faisal Hushim 1 , Amir Khalid 1 , Md Norrizam Mohmad Ja'at 1 , Muhammad Fauzi Samsubaha 2 , Tuan Mohamad Kamarul Hisyam Tuan A Talib 2 1 Centre for Energy and Industrial Environment Studies (CEIES), Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Pt. Raja, Batu Pahat, Johor, Malaysia 2 Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Pt. Raja, Batu Pahat, Johor, Malaysia ARTICLE INFO ABSTRACT Article history: Received 19 October 2018 Received in revised form 20 December 2018 Accepted 23 December 2018 Available online 9 January 2019 Direct imaging technique is always used to obtain correlation of flame height or any other parameter of the visible portions of the flame. This is one of the important methods used in the combustion community to determine the characteristic of flame. Recently, the imaging technique has been developed and enhanced to provide more accurate data. However the utilization of the technology, such as the used of laser- based technique and acquiring sensor, increased the complexity of the process and also increased the amount of cost practically. This paper presents the results of an acoustic excitation towards a Liquid petroleum gaseous flame by using the direct visualizing technique. The direct visualizing technique is used to acquire the flame image and the images will be analyzed by using image analysis software. Results show the flame length at the flame core decreases when the amount of acoustic gradually increases. The effect of excitation towards the flame core is being investigated due to its significant influence toward the overall flame characteristic. Keywords: Acoustic excitation, jet flame, liquid petroleum gaseous Copyright © 2019 PENERBIT AKADEMIA BARU - All rights reserved Introduction Direct imaging technique is always used for obtaining a correlation of flame height or any other parameter of the visible portions of the flame. This is one of the important methods used in the combustion community to determine the characteristic of flame. Being able to quantify the parameter will improve the understanding of the flame characteristic. It is known that exciting acoustic could affect the flame dynamic [1-3]. Some of the perturbation may induce unstable flame behavior while at certain range of frequency, it can improve the burning efficiency and reducing the amount of produced carbon [4-5]. Recently, imaging technique has been developed and improved so that the information gather will be significant and can be processed into meaning full information. However the utilization of the  Corresponding author. Email address: azahari@uthm.edu.my (Mohd Azahari Razali) Open Access